Update mheap/github-action-required-labels digest to 8afbe8a (#4884)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/pull_request.yaml

@@ -15,7 +15,7 @@ jobs:
         name: Preview Changelog
         runs-on: ubuntu-24.04
         steps:
-            - uses: mheap/github-action-required-labels@388fd6af37b34cdfe5a23b37060e763217e58b03 # v5
+            - uses: mheap/github-action-required-labels@8afbe8ae6ab7647d0c9f0cfa7c2f939650d22509 # v5
               if: github.event_name != 'merge_group'
               with:
                   labels: |