Update dependency phpstan/phpstan to v2

Author: renovate[bot]

composer.json

@@ -20,7 +20,7 @@
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3",
         "php-di/php-di": "^6",
-        "phpstan/phpstan": "^1",
+        "phpstan/phpstan": "^2",
         "phpunit/phpunit": "^6 || ^7",
         "squizlabs/php_codesniffer": "^3"
     },