Change PHP version in "rector-cs.yml" (#151)

Author: vjik

.github/workflows/rector-cs.yml

@@ -24,4 +24,4 @@ jobs:
       token: ${{ secrets.YIISOFT_GITHUB_TOKEN }}
     with:
       repository: ${{ github.event.pull_request.head.repo.full_name }}
-      php: '8.4'
+      php: '8.1'