Update php-test.yml

Author: SMillerDev

.github/workflows/php-test.yml

@@ -80,7 +80,7 @@ jobs:
       - name: Setup PHPStan
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.1'
+          php-version: '7.4'
 
       - name: Setup problem matchers for PHP
         run: echo "::add-matcher::${{ runner.tool_cache }}/php.json"