Send update PR to phpstan-src 1.9.x

Author: ondrejmirtes

.github/workflows/send-pr.yml

@@ -21,6 +21,7 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: phpstan/phpstan-src
+          ref: 1.9.x
           path: phpstan-src
           token: ${{ secrets.PHPSTAN_BOT_TOKEN }}