fix: missing closing paren in agent_endpoints get_agents Query()

The `health_check` Query() call was missing its closing parenthesis,
causing a SyntaxError that blocked all proxy_server imports.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

litellm/proxy/agent_endpoints/endpoints.py

@@ -106,6 +106,7 @@ async def get_agents(
     health_check: bool = Query(
         False,
         description="When true, performs a GET request to each agent's URL. Agents with reachable URLs (HTTP status < 500) and agents without a URL are returned; unreachable agents are filtered out.",
+    ),
     user_api_key_dict: UserAPIKeyAuth = Depends(user_api_key_auth),  # Used for auth
 ):
     """