Fix linting errors

backend/config/config_loader.py

@@ -4,7 +4,7 @@
 import pydash
 from yaml.loader import SafeLoader
 from urllib.parse import quote_plus
-from typing import TypedDict
+from typing_extensions import TypedDict
 
 from config import (
     ROMM_DB_DRIVER,

backend/main.py

@@ -7,7 +7,7 @@
 from fastapi_pagination import add_pagination
 from starlette.middleware.authentication import AuthenticationMiddleware
 from starlette.middleware.sessions import SessionMiddleware
-from typing import TypedDict
+from typing_extensions import TypedDict
 
 from config import (
     DEV_PORT,