Update deprecated Python 3.8 typing (#13971)

tests/v1/engine/test_engine_core.py

@@ -5,7 +5,6 @@ import threading
 import time
 import uuid
 from concurrent.futures import Future
-from typing import List
 
 import pytest
 from transformers import AutoTokenizer
@@ -213,7 +212,7 @@ def test_engine_core_concurrent_batches(monkeypatch):
     class DummyExecutor(UniProcExecutor):
 
         def initialize_from_config(
-                self, kv_cache_configs: List[KVCacheConfig]) -> None:
+                self, kv_cache_configs: list[KVCacheConfig]) -> None:
             super().initialize_from_config(kv_cache_configs)
 
             # This executor actually can only run 1 batch at a time