deps: Bump `com_github_bazelbuild_buildtools` -> 4.2.3 (#18931)

Fix #18793

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

Mirrored from https://github.com/envoyproxy/envoy @ 5d0dee8378468893b810fec82f88f4af684553e7

bazel/repository_locations.bzl

@@ -32,9 +32,9 @@ REPOSITORY_LOCATIONS_SPEC = 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 = "4.2.2",
-        sha256 = "ae34c344514e08c23e90da0e2d6cb700fcd28e80c02e23e4d5715dddcb42f7b3",
-        release_date = "2021-10-07",
+        version = "4.2.3",
+        sha256 = "614c84128ddb86aab4e1f25ba2e027d32fd5c6da302ae30685b9d7973b13da1b",
+        release_date = "2021-10-26",
         strip_prefix = "buildtools-{version}",
         urls = ["https://github.com/bazelbuild/buildtools/archive/{version}.tar.gz"],
         use_category = ["api"],