Header blocks must be separated by a single blank line

Error: Command failed: php phpcs.phar --report=checkstyle --standard=phpcs.xml project/public/index.php

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2, tinovyatkin/action-php-codesniffer@v1. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.