Bump mheap/github-action-required-labels from 4 to 5 (#3926)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/block_merge.yml

@@ -6,7 +6,7 @@ jobs:
   block_merge:
     runs-on: ubuntu-latest
     steps:
-      - uses: mheap/github-action-required-labels@v4
+      - uses: mheap/github-action-required-labels@v5
         with:
           mode: exactly
           count: 0