Bump mheap/github-action-required-labels from 2 to 3

Bumps [mheap/github-action-required-labels](https://github.com/mheap/github-action-required-labels) from 2 to 3.
- [Release notes](https://github.com/mheap/github-action-required-labels/releases)
- [Commits](mheap/github-action-required-labels@v2...v3)

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

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

.github/workflows/block-merge.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: mheap/github-action-required-labels@v2
+      - uses: mheap/github-action-required-labels@v3
         with:
           mode: exactly
           count: 0