Bump bazel-contrib/.github from 5 to 6

Bumps [bazel-contrib/.github](https://github.com/bazel-contrib/.github) from 5 to 6.
- [Commits](bazel-contrib/.github@v5...v6)

---
updated-dependencies:
- dependency-name: bazel-contrib/.github
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/release.yaml

@@ -12,7 +12,7 @@ on:
 jobs:
   release:
     # Re-use https://github.com/bazel-contrib/.github/blob/v5/.github/workflows/release_ruleset.yaml
-    uses: bazel-contrib/.github/.github/workflows/release_ruleset.yaml@v5
+    uses: bazel-contrib/.github/.github/workflows/release_ruleset.yaml@v6
     with:
       prerelease: false
       release_files: robolectric-bazel-*.tar.gz