fix: extenstion phpstan

Author: ddevsr

.github/workflows/downgraded_release.yaml

@@ -7,7 +7,6 @@
         "php": ">=8.1",
         "rector/rector": "^1.0",
         "codeigniter/phpstan-codeigniter": "^1.4",
-        "phpstan/extension-installer": "^1.3",
         "phpstan/phpstan": "^1.11",
         "phpstan/phpstan-strict-rules": "^1.6"
     },