phpstan level 5 (#134)

Author: Rom1-B

composer.json

@@ -4,7 +4,11 @@
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.73",
-        "glpi-project/tools": "^0.7"
+        "glpi-project/tools": "^0.7.4",
+        "php-parallel-lint/php-parallel-lint": "^1.4",
+        "phpstan/extension-installer": "^1.4",
+        "phpstan/phpstan": "^2.1",
+        "phpstan/phpstan-deprecation-rules": "^2.0"
     },
     "config": {
         "optimize-autoloader": true,