update labeler to new config format

Signed-off-by: Martin Schurz <[email protected]>

.github/workflows/enforce-labels.yml

@@ -9,6 +9,6 @@ jobs:
     if: github.repository == 'dev-sec/ansible-collection-hardening'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/labeler@main
+      - uses: actions/labeler@5.0.0
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"