chore(deps): update dependency phpstan/phpstan to v1.9.1

Author: renovate[bot]

composer.json

@@ -29,7 +29,7 @@
         "infection/infection": "^0.26.0",
         "kwn/php-rdkafka-stubs": "^2.0",
         "phpstan/extension-installer": "^1.1",
-        "phpstan/phpstan": "1.9.0",
+        "phpstan/phpstan": "1.9.1",
         "phpstan/phpstan-phpunit": "1.2.2",
         "phpstan/phpstan-strict-rules": "1.4.4",
         "phpunit/phpunit": "^9.2",