deps: Remove `com_github_bazel_buildtools` (#20182)

Fix #19918

Signed-off-by: Ryan Northey <ryan@synca.io>

Mirrored from https://github.com/envoyproxy/envoy @ b2d449eb1f130d9f8d01af4ef2da89416b2157db

bazel/repositories.bzl

@@ -22,9 +22,6 @@ def api_dependencies():
     external_http_archive(
         name = "com_google_googleapis",
     )
-    external_http_archive(
-        name = "com_github_bazelbuild_buildtools",
-    )
     external_http_archive(
         name = "com_github_cncf_udpa",
     )

bazel/repository_locations.bzl

@@ -28,17 +28,6 @@ REPOSITORY_LOCATIONS_SPEC = dict(
             "org_golang_x_text",
         ],
     ),
-    com_github_bazelbuild_buildtools = dict(
-        project_name = "Bazel build tools",
-        project_desc = "Developer tools for working with Google's bazel buildtool.",
-        project_url = "https://github.com/bazelbuild/buildtools",
-        version = "4.2.5",
-        sha256 = "d368c47bbfc055010f118efb2962987475418737e901f7782d2a966d1dc80296",
-        release_date = "2022-01-13",
-        strip_prefix = "buildtools-{version}",
-        urls = ["https://github.com/bazelbuild/buildtools/archive/{version}.tar.gz"],
-        use_category = ["api"],
-    ),
     com_github_cncf_udpa = dict(
         project_name = "xDS API",
         project_desc = "xDS API Working Group (xDS-WG)",