ci: skip commitlint for dependabot and release-please PRs

Author: petercorke

.github/workflows/commitlint.yml

@@ -8,6 +8,8 @@ jobs:
   commitlint:
     name: Check PR title (Conventional Commits)
     runs-on: ubuntu-latest
+    # Dependabot and release-please manage their own titles — skip them.
+    if: ${{ github.actor != 'dependabot[bot]' && github.actor != 'github-actions[bot]' }}
     steps:
       - uses: amannn/action-semantic-pull-request@v5
         env: