integrate some generated stubs

django-stubs-generated/apps/config.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Iterator, Optional, Type
+from typing import Any, Iterator, Type
 
 from django.db.models.base import Model
 

django-stubs-generated/apps/registry.pyi

@@ -1,3 +1,4 @@
+import collections
 from typing import Any, Callable, List, Optional, Tuple, Type, Union
 
 from django.apps.config import AppConfig