Update PHPStan dependencies

Signed-off-by: simonhammes <simonhammes@users.noreply.github.com>

Author: simonhammes

composer.json

@@ -20,10 +20,10 @@
     },
     "require-dev": {
         "guzzlehttp/guzzle": "^6.3|^7.0",
-        "phpstan/extension-installer": "^1.0",
-        "phpstan/phpstan": "^1.5.4",
-        "phpstan/phpstan-phpunit": "^1.1.0",
-        "phpstan/phpstan-strict-rules": "^1.1.0",
+        "phpstan/extension-installer": "^1.4",
+        "phpstan/phpstan": "^2.1",
+        "phpstan/phpstan-phpunit": "^2.0",
+        "phpstan/phpstan-strict-rules": "^2.0",
         "phpunit/phpunit": "^9.4",
         "squizlabs/php_codesniffer": "^3.6",
         "symfony/polyfill-apcu": "^1.6"