[Python Dependency] Bump urllib3 from 1.26.5 to 1.26.18 (#34714)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.5 to 1.26.18.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/urllib3/urllib3/releases">urllib3's releases</a>.</em></p>
<blockquote>
<h2>1.26.18</h2>
<ul>
<li>Made body stripped from HTTP requests changing the request method to GET after HTTP 303 &quot;See Other&quot; redirect responses. (GHSA-g4mx-q9vg-27p4)</li>
</ul>
<h2>1.26.17</h2>
<ul>
<li>Added the <code>Cookie</code> header to the list of headers to strip from requests when redirecting to a different host. As before, different headers can be set via <code>Retry.remove_headers_on_redirect</code>. (GHSA-v845-jxx5-vc9f)</li>
</ul>
<h2>1.26.16</h2>
<ul>
<li>Fixed thread-safety issue where accessing a <code>PoolManager</code> with many distinct origins would cause connection pools to be closed while requests are in progress (<a href="https://redirect.github.com/urllib3/urllib3/issues/2954">#2954</a>)</li>
</ul>
<h2>1.26.15</h2>
<ul>
<li>Fix socket timeout value when HTTPConnection is reused (<a href="https://redirect.github.com/urllib3/urllib3/issues/2645">urllib3/urllib3#2645</a>)</li>
<li>Remove &quot;!&quot; character from the unreserved characters in IPv6 Zone ID parsing (<a href="https://redirect.github.com/urllib3/urllib3/issues/2899">urllib3/urllib3#2899</a>)</li>
<li>Fix IDNA handling of 'x80' byte (<a href="https://redirect.github.com/urllib3/urllib3/issues/2901">urllib3/urllib3#2901</a>)</li>
</ul>
<h2>1.26.14</h2>
<ul>
<li>Fixed parsing of port 0 (zero) returning None, instead of 0 (<a href="https://redirect.github.com/urllib3/urllib3/issues/2850">#2850</a>)</li>
<li>Removed deprecated <code>HTTPResponse.getheaders()</code> calls in <code>urllib3.contrib</code> module.</li>
</ul>
<h2>1.26.13</h2>
<ul>
<li>Deprecated the <code>HTTPResponse.getheaders()</code> and <code>HTTPResponse.getheader()</code> methods.</li>
<li>Fixed an issue where parsing a URL with leading zeroes in the port would be rejected even when the port number after removing the zeroes was valid.</li>
<li>Fixed a deprecation warning when using cryptography v39.0.0.</li>
<li>Removed the <code>&lt;4</code> in the <code>Requires-Python</code> packaging metadata field.</li>
</ul>
<h2>1.26.12</h2>
<ul>
<li>Deprecated the <code>urllib3[secure]</code> extra and the <code>urllib3.contrib.pyopenssl</code> module. Both will be removed in v2.x. See this <a href="https://redirect.github.com/urllib3/urllib3/issues/2680">GitHub issue</a> for justification and info on how to migrate.</li>
</ul>
<h2>1.26.11</h2>
<p><strong>If you or your organization rely on urllib3 consider supporting us via <a href="https://github.com/sponsors/urllib3">GitHub Sponsors</a>.</strong></p>
<p>⚠️ <strong>urllib3 v2.0 will drop support for Python 2</strong>: <a href="https://urllib3.readthedocs.io/en/latest/v2-roadmap.html">Read more in the v2.0 Roadmap</a></p>
<ul>
<li>Fixed an issue where reading more than 2 GiB in a call to HTTPResponse.read would raise an OverflowError on Python 3.9 and earlier.</li>
</ul>
<h2>1.26.10</h2>
<p><strong>If you or your organization rely on urllib3 consider supporting us via <a href="https://github.com/sponsors/urllib3">GitHub Sponsors</a>.</strong></p>
<p>⚠️ <strong>urllib3 v2.0 will drop support for Python 2</strong>: <a href="https://urllib3.readthedocs.io/en/latest/v2-roadmap.html">Read more in the v2.0 Roadmap</a></p>
<p>🔐 <strong>This is the first release to be signed with Sigstore!</strong> You can verify the distributables using the <code>.sig</code> and <code>.crt</code> files included on this release.</p>
<ul>
<li>Removed support for Python 3.5</li>
<li>Fixed an issue where a <code>ProxyError</code> recommending configuring the proxy as HTTP instead of HTTPS could appear even when an HTTPS proxy wasn't configured.</li>
</ul>
<h2>1.26.9</h2>
<p><strong>If you or your organization rely on urllib3 consider supporting us via <a href="https://github.com/sponsors/urllib3">GitHub Sponsors</a>.</strong></p>
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</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/urllib3/urllib3/blob/main/CHANGES.rst">urllib3's changelog</a>.</em></p>
<blockquote>
<h1>1.26.18 (2023-10-17)</h1>
<ul>
<li>Made body stripped from HTTP requests changing the request method to GET after HTTP 303 &quot;See Other&quot; redirect responses.</li>
</ul>
<h1>1.26.17 (2023-10-02)</h1>
<ul>
<li>Added the <code>Cookie</code> header to the list of headers to strip from requests when redirecting to a different host. As before, different headers can be set via <code>Retry.remove_headers_on_redirect</code>. (<code>[#3139](https://github.com/urllib3/urllib3/issues/3139) &lt;https://github.com/urllib3/urllib3/pull/3139&gt;</code>_)</li>
</ul>
<h1>1.26.16 (2023-05-23)</h1>
<ul>
<li>Fixed thread-safety issue where accessing a <code>PoolManager</code> with many distinct origins
would cause connection pools to be closed while requests are in progress (<code>[#2954](https://github.com/urllib3/urllib3/issues/2954) &lt;https://github.com/urllib3/urllib3/pull/2954&gt;</code>_)</li>
</ul>
<h1>1.26.15 (2023-03-10)</h1>
<ul>
<li>Fix socket timeout value when <code>HTTPConnection</code> is reused (<code>[#2645](https://github.com/urllib3/urllib3/issues/2645) &lt;https://github.com/urllib3/urllib3/issues/2645&gt;</code>__)</li>
<li>Remove &quot;!&quot; character from the unreserved characters in IPv6 Zone ID parsing
(<code>[#2899](https://github.com/urllib3/urllib3/issues/2899) &lt;https://github.com/urllib3/urllib3/issues/2899&gt;</code>__)</li>
<li>Fix IDNA handling of '\x80' byte (<code>[#2901](https://github.com/urllib3/urllib3/issues/2901) &lt;https://github.com/urllib3/urllib3/issues/2901&gt;</code>__)</li>
</ul>
<h1>1.26.14 (2023-01-11)</h1>
<ul>
<li>Fixed parsing of port 0 (zero) returning None, instead of 0. (<code>[#2850](https://github.com/urllib3/urllib3/issues/2850) &lt;https://github.com/urllib3/urllib3/issues/2850&gt;</code>__)</li>
<li>Removed deprecated getheaders() calls in contrib module. Fixed the type hint of <code>PoolKey.key_retries</code> by adding <code>bool</code> to the union. (<code>[#2865](https://github.com/urllib3/urllib3/issues/2865) &lt;https://github.com/urllib3/urllib3/issues/2865&gt;</code>__)</li>
</ul>
<h1>1.26.13 (2022-11-23)</h1>
<ul>
<li>Deprecated the <code>HTTPResponse.getheaders()</code> and <code>HTTPResponse.getheader()</code> methods.</li>
<li>Fixed an issue where parsing a URL with leading zeroes in the port would be rejected
even when the port number after removing the zeroes was valid.</li>
<li>Fixed a deprecation warning when using cryptography v39.0.0.</li>
<li>Removed the <code>&lt;4</code> in the <code>Requires-Python</code> packaging metadata field.</li>
</ul>
<h1>1.26.12 (2022-08-22)</h1>
<ul>
<li>Deprecated the <code>urllib3[secure]</code> extra and the <code>urllib3.contrib.pyopenssl</code> module.
Both will be removed in v2.x. See this <code>GitHub issue &lt;https://github.com/urllib3/urllib3/issues/2680&gt;</code>_
for justification and info on how to migrate.</li>
</ul>
<h1>1.26.11 (2022-07-25)</h1>
<ul>
<li>Fixed an issue where reading more than 2 GiB in a call to <code>HTTPResponse.read</code> would</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="9c2c2307dd"><code>9c2c230</code></a> Release 1.26.18 (<a href="https://redirect.github.com/urllib3/urllib3/issues/3159">#3159</a>)</li>
<li><a href="b594c5ceac"><code>b594c5c</code></a> Merge pull request from GHSA-g4mx-q9vg-27p4</li>
<li><a href="944f0eb134"><code>944f0eb</code></a> [1.26] Use vendored six in urllib3.contrib.securetransport</li>
<li><a href="c9016bf464"><code>c9016bf</code></a> Release 1.26.17</li>
<li><a href="01220354d3"><code>0122035</code></a> Backport GHSA-v845-jxx5-vc9f (<a href="https://redirect.github.com/urllib3/urllib3/issues/3139">#3139</a>)</li>
<li><a href="e63989f97d"><code>e63989f</code></a> Fix installing <code>brotli</code> extra on Python 2.7</li>
<li><a href="2e7a24d087"><code>2e7a24d</code></a> [1.26] Configure OS for RTD to fix building docs</li>
<li><a href="57181d6ea9"><code>57181d6</code></a> [1.26] Improve error message when calling urllib3.request() (<a href="https://redirect.github.com/urllib3/urllib3/issues/3058">#3058</a>)</li>
<li><a href="3c0148048a"><code>3c01480</code></a> [1.26] Run coverage even with failed jobs</li>
<li><a href="d94029b7e2"><code>d94029b</code></a> Release 1.26.16</li>
<li>Additional commits viewable in <a href="https://github.com/urllib3/urllib3/compare/1.26.5...1.26.18">compare view</a></li>
</ul>
</details>
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Closes #34714

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/34714 from grpc:dependabot/pip/urllib3-1.26.18 3281b127f3
PiperOrigin-RevId: 597334547

requirements.bazel.txt

@@ -6,7 +6,7 @@ wheel==0.38.1
 google-auth==1.24.0
 oauth2client==4.1.0
 requests==2.25.1
-urllib3==1.26.5
+urllib3==1.26.18
 chardet==3.0.4
 certifi==2023.7.22
 idna==2.7