Update PHPStan to 2.x

Author: mmoll

composer.json

@@ -33,8 +33,8 @@
         "ergebnis/composer-normalize": ">=2.19 <2.30",
         "nikic/php-parser": "< 5.0.1",
         "phan/phan": "^5.4.5",
-        "phpstan/phpstan": "^1.12",
-        "phpstan/phpstan-strict-rules": "^1.6",
+        "phpstan/phpstan": "^2.0",
+        "phpstan/phpstan-strict-rules": "^2.0",
         "phpunit/phpunit": "^9.6.15",
         "psalm/plugin-phpunit": "^0.19",
         "sabre/event": ">= 5.1.6",

phpstan.neon

@@ -1,5 +1,5 @@
 parameters:
-    level: max
+    level: 9
     bootstrapFiles:
         - %rootDir%/../../../tests/static_analysis_bootstrap.php
     paths: