Merge pull request #540 from rules-proto-grpc/renovate/actions-labeler-6.x

Update actions/labeler action to v6

Author: aaliddell

.github/workflows/labeler.yml

@@ -6,7 +6,7 @@ jobs:
   label:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/labeler@8558fd74291d67161a8a78ce36a881fa63b766a9 # v5
+      - uses: actions/labeler@634933edcd8ababfe52f92936142cc22ac488b1b # v6
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"
           sync-labels: true