fixing mypy

Author: eadwinCode

ninja_extra/conf/settings.py

@@ -1,7 +1,7 @@
 from typing import Any, Dict, List, Optional
 
 from django.conf import settings as django_settings
-from django.test.signals import setting_changed
+from django.core.signals import setting_changed
 from ninja import Schema
 from pydantic import Field, root_validator, validator