Add PHP 8.4

Author: lcharette

.github/workflows/PHPStan.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php_versions: ['8.1', '8.2', '8.3']
+        php_versions: ['8.1', '8.2', '8.3', '8.4']
 
     runs-on: ubuntu-latest
     name: PHPStan - ${{ matrix.php_versions }}