fix: add explicit timeout to OpenAPI tool httpx client

src/google/adk/tools/openapi_tool/openapi_spec_parser/rest_api_tool.py

@@ -571,6 +571,7 @@ def __repr__(self):
 
 async def _request(**request_params) -> httpx.Response:
  async with httpx.AsyncClient(
- verify=request_params.pop("verify", True)
+ verify=request_params.pop("verify", True),
+ timeout=request_params.pop("timeout", httpx.Timeout(600.0)),
  ) as client:
  return await client.request(**request_params)