remove unused import

Signed-off-by: Lu Fang <[email protected]>

Author: luccafong

examples/online_serving/multi_instance_data_parallel.py

@@ -2,7 +2,6 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import asyncio
 import threading
-from typing import Optional
 
 from vllm.engine.arg_utils import AsyncEngineArgs
 from vllm.engine.async_llm_engine import AsyncLLMEngine