Update PHPStan packages to v2

Author: renovate[bot]

Diff for: composer.json

@@ -22,9 +22,9 @@
         "squizlabs/php_codesniffer": "^3.6",
         "phpmd/phpmd": "^2.14",
         "phpunit/phpunit": "^9.6",
-        "phpstan/phpstan": "^1.10",
-        "phpstan/phpstan-phpunit": "^1.3",
-        "phpstan/phpstan-strict-rules": "^1.5",
+        "phpstan/phpstan": "^2.0",
+        "phpstan/phpstan-phpunit": "^2.0",
+        "phpstan/phpstan-strict-rules": "^2.0",
         "phpstan/extension-installer": "^1.3"
     },
     "autoload": {