Update test_ve_a2a_middlewares.py

Author: loveyana

tests/test_ve_a2a_middlewares.py

@@ -273,7 +273,7 @@ async def mock_call_next(request):
                 mock_auth_config.exchanged_auth_credential = Mock()
                 mock_build_config.return_value = mock_auth_config
 
-                response = await middleware.dispatch(mock_request, mock_call_next)
+                _ = await middleware.dispatch(mock_request, mock_call_next)
 
         # Verify TIP token was used for workload token exchange
         mock_identity_client.get_workload_access_token.assert_called_once_with(