Bump mheap/github-action-required-labels from 2 to 5

Bumps [mheap/github-action-required-labels](https://github.com/mheap/github-action-required-labels) from 2 to 5.
- [Release notes](https://github.com/mheap/github-action-required-labels/releases)
- [Commits](mheap/github-action-required-labels@v2...v5)

---
updated-dependencies:
- dependency-name: mheap/github-action-required-labels
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/required_labels.yml

@@ -10,7 +10,7 @@ jobs:
     name: Enforcing cherrypick labels
     runs-on: ubuntu-latest
     steps:
-      - uses: mheap/github-action-required-labels@v2
+      - uses: mheap/github-action-required-labels@v5
         with:
           mode: exactly
           count: 1