chore: pin phpstan to 2.1.34 (#9897)

Author: samsonasik

composer.json

@@ -23,7 +23,7 @@
         "mikey179/vfsstream": "^1.6.12",
         "nexusphp/tachycardia": "^2.0",
         "phpstan/extension-installer": "^1.4",
-        "phpstan/phpstan": "^2.0",
+        "phpstan/phpstan": "2.1.34",
         "phpstan/phpstan-strict-rules": "^2.0",
         "phpunit/phpcov": "^9.0.2 || ^10.0",
         "phpunit/phpunit": "^10.5.16 || ^11.2",