update jsonrpc handler test

Author: yarolegovich

tests/server/request_handlers/test_jsonrpc_handler.py

@@ -149,6 +149,7 @@ async def test_on_cancel_task_success(self) -> None:
         call_context = ServerCallContext(state={'foo': 'bar'})
 
         async def streaming_coro():
+            mock_task.status.state = TaskState.canceled
             yield mock_task
 
         with patch(