chore(deps): update phpstan packages to v2

Author: renovate[bot]

composer.json

@@ -23,9 +23,9 @@
     "nyholm/psr7": "^1.5",
     "phpbench/phpbench": "^1.2",
     "phpstan/extension-installer": "^1.1",
-    "phpstan/phpstan": "1.12.12",
-    "phpstan/phpstan-phpunit": "1.4.1",
-    "phpstan/phpstan-strict-rules": "1.6.1",
+    "phpstan/phpstan": "2.1.8",
+    "phpstan/phpstan-phpunit": "2.0.4",
+    "phpstan/phpstan-strict-rules": "2.0.3",
     "phpunit/phpunit": "^9.5 || ^10.5.21 || ^11",
     "psr/http-message": "^1 || ^2",
     "react/http": "^1.6",