TASK: Narrow phpstan version to prevent errors in CI

Author: Sebobo

composer.json

@@ -15,7 +15,7 @@
     "require-dev": {
         "neos/content-repository": "^8.3",
         "phpunit/phpunit": "^11.0",
-        "phpstan/phpstan": "^1.12 || ^2"
+        "phpstan/phpstan": "^1.12"
     },
     "autoload": {
         "psr-4": {