Bump mheap/github-action-required-labels from 5.5.0 to 5.5.1

Bumps [mheap/github-action-required-labels](https://github.com/mheap/github-action-required-labels) from 5.5.0 to 5.5.1.
- [Release notes](https://github.com/mheap/github-action-required-labels/releases)
- [Commits](mheap/github-action-required-labels@388fd6a...8afbe8a)

---
updated-dependencies:
- dependency-name: mheap/github-action-required-labels
  dependency-version: 5.5.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/block_merge.yml

@@ -6,7 +6,7 @@ jobs:
   block_merge:
     runs-on: ubuntu-latest
     steps:
-      - uses: mheap/github-action-required-labels@388fd6af37b34cdfe5a23b37060e763217e58b03 # infered from @v5
+      - uses: mheap/github-action-required-labels@8afbe8ae6ab7647d0c9f0cfa7c2f939650d22509 # infered from @v5
         with:
           mode: exactly
           count: 0