feat: migrate PHPStan 1 => 2

Author: Chris8934

composer.json

@@ -56,7 +56,7 @@
     "nyholm/nsa": "^1.3",
     "nyholm/psr7": "^1.8",
     "nyholm/symfony-bundle-test": "^3.1",
-    "phpstan/phpstan": "^1.9.2",
+    "phpstan/phpstan": "^2.1",
     "psr/http-client": "^1.0",
     "psr/simple-cache": "^1.0 || ^2.0 || ^3.0",
     "symfony/cache": "^6.4 || ^7.0 || ^8.0",
@@ -78,7 +78,8 @@
     }
   },
   "scripts": {
-    "test": "SYMFONY_DEPRECATIONS_HELPER=ignoreFile='./tests/baseline-ignore' vendor/bin/simple-phpunit --testsuite main"
+    "test": "SYMFONY_DEPRECATIONS_HELPER=ignoreFile='./tests/baseline-ignore' vendor/bin/simple-phpunit --testsuite main",
+    "phpstan": "vendor/bin/phpstan --memory-limit=1024m"
   },
   "config": {
     "allow-plugins": {