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

backend/open_webui/retrieval/models/external.py

@@ -1,9 +1,8 @@
 import logging
-import requests
-from typing import Optional, List, Tuple
+from typing import List, Optional, Tuple
 from urllib.parse import quote
 
-
+import requests
 from open_webui.env import ENABLE_FORWARD_USER_INFO_HEADERS, REQUESTS_VERIFY
 from open_webui.retrieval.models.base_reranker import BaseReranker
 from open_webui.utils.headers import include_user_info_headers