Update labeler.yml

.github/workflows/labeler.yml

@@ -10,5 +10,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/labeler@v4
+        # Checking the actor will prevent your Action run failing on non-Dependabot
+        # PRs but also ensures that it only does work for Dependabot PRs.
+        if: ${{ github.actor == 'github-actions[bot]' }}
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"