Use PHPStan 2.1.x

Author: spaze

composer.json

@@ -21,8 +21,8 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^7.5.15|^8.5|^9.0",
-        "phpstan/phpstan": "^1.9",
-        "phpstan/phpstan-strict-rules": "^1.6",
+        "phpstan/phpstan": "^2.1",
+        "phpstan/phpstan-strict-rules": "^2.0",
         "friendsofphp/php-cs-fixer": "^3.0",
         "vimeo/psalm": "^5.26|^6.13"
     },