refac: modernize type annotations (PEP 604 / PEP 585)

backend/open_webui/utils/access_control/files.py

@@ -1,14 +1,13 @@
 import logging
 
-from open_webui.models.users import UserModel
-from open_webui.models.files import Files
-from open_webui.models.knowledge import Knowledges
+from open_webui.models.access_grants import AccessGrants
 from open_webui.models.channels import Channels
 from open_webui.models.chats import Chats
+from open_webui.models.files import Files
 from open_webui.models.groups import Groups
+from open_webui.models.knowledge import Knowledges
 from open_webui.models.models import Models
-from open_webui.models.access_grants import AccessGrants
-
+from open_webui.models.users import UserModel
 from sqlalchemy.ext.asyncio import AsyncSession
 
 log = logging.getLogger(__name__)