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

backend/open_webui/utils/mcp/client.py

@@ -1,17 +1,16 @@
 import asyncio
 import logging
-from typing import Optional
 from contextlib import AsyncExitStack
+from typing import Optional
 
 log = logging.getLogger(__name__)
 
 import anyio
-
+import httpx
 from mcp import ClientSession
 from mcp.client.auth import OAuthClientProvider, TokenStorage
 from mcp.client.streamable_http import streamablehttp_client
 from mcp.shared.auth import OAuthClientInformationFull, OAuthClientMetadata, OAuthToken
-import httpx
 from open_webui.env import AIOHTTP_CLIENT_SESSION_TOOL_SERVER_SSL, AIOHTTP_CLIENT_TIMEOUT_TOOL_SERVER