Update PHPStan

Author: dktapps

composer.json

@@ -8,10 +8,10 @@
         "pocketmine/binaryutils": "^0.2.0"
     },
     "require-dev": {
-        "phpstan/phpstan": "1.10.25",
+        "phpstan/phpstan": "2.1.0",
         "phpunit/phpunit": "^9.5",
         "phpstan/extension-installer": "^1.0",
-        "phpstan/phpstan-strict-rules": "^1.0"
+        "phpstan/phpstan-strict-rules": "^2.0"
     },
     "license": "LGPL-3.0",
     "autoload": {