ci: use forked ConventionalCommits validation workflow (#453)

.github/workflows/prs.yaml

@@ -8,6 +8,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: PR Conventional Commit Validation
-        uses: ytanikin/PRConventionalCommits@1.3.0
+        uses: f-eld-ch/PRConventionalCommits@main
         with:
           task_types: '["feat","fix","docs","test","ci","refactor","perf","chore","revert", "security"]'