message: update pin of bazel-toolchain repo
  bazel-toolchain repo updated to the latest release according to:
diff: @@ -675,11 +675,11 @@ def tf_workspace(path_prefix="", tf_repo_name=""):
  tf_http_archive(
  name = "bazel_toolchains",
  urls = [
  - "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/44200e0c026d86c53470d107b3697a3e46469c43.tar.gz",
  - "https://github.com/bazelbuild/bazel-toolchains/archive/44200e0c026d86c53470d107b3697a3e46469c43.tar.gz",
  + "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/2cec6c9f6d12224e93d9b3f337b24e41602de3ba.tar.gz",
  + "https://github.com/bazelbuild/bazel-toolchains/archive/2cec6c9f6d12224e93d9b3f337b24e41602de3ba.tar.gz",
  ],
  - strip_prefix = "bazel-toolchains-44200e0c026d86c53470d107b3697a3e46469c43",
  - sha256 = "699b55a6916c687f4b7dc092dbbf5f64672cde0dc965f79717735ec4e5416556",
  + strip_prefix = "bazel-toolchains-2cec6c9f6d12224e93d9b3f337b24e41602de3ba",
  + sha256 = "9b8d85b61d8945422e86ac31e4d4d2d967542c080d1da1b45364da7fd6bdd638",
  )
  tf_http_archive(
  