Update dependency phpstan/phpstan to v2

Author: renovate[bot]

composer.json

@@ -28,7 +28,7 @@
         "mockery/mockery": "^1.2.3",
         "php-http/message": "^1.0",
         "phpstan/extension-installer": "^1.0",
-        "phpstan/phpstan": "^1.0.0",
+        "phpstan/phpstan": "^2.0.0",
         "phpstan/phpstan-beberlei-assert": "^1.0.0",
         "phpstan/phpstan-mockery": "^1.0.0",
         "phpstan/phpstan-phpunit": "^1.0.0",