ci: bump pr-title-check action to v1.6.1

Author: janbuchar

.github/workflows/on_pull_request.yaml

@@ -13,7 +13,7 @@ jobs:
     name: PR title check
     runs-on: ubuntu-latest
     steps:
-      - uses: apify/actions/pr-title-check@v1.5.0
+      - uses: apify/actions/pr-title-check@v1.6.1
 
   checks:
     name: Checks