Potential fix for code scanning alert no. 10: Workflow does not contain permissions

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: agrgr

.github/workflows/required-labels.yml

@@ -1,5 +1,7 @@
 #  https://github.com/mheap/github-action-required-labels
 name: Pull Request Required Labels
+permissions:
+  contents: read
 on:
   pull_request:
     types: [ opened, labeled, unlabeled, synchronize ]