[Misc] Replace Optional[X] with X | None syntax (#33332)

Signed-off-by: carlory <baofa.fan@daocloud.io>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

vllm/v1/utils.py

@@ -14,7 +14,6 @@ from typing import (
     TYPE_CHECKING,
     Any,
     Generic,
-    Optional,
     TypeVar,
     Union,
     overload,
@@ -229,7 +228,7 @@ def wait_for_completion_or_failure(
     api_server_manager: APIServerProcessManager,
     engine_manager: Union["CoreEngineProcManager", "CoreEngineActorManager"]
     | None = None,
-    coordinator: Optional["DPCoordinator"] = None,
+    coordinator: "DPCoordinator | None" = None,
 ) -> None:
     """Wait for all processes to complete or detect if any fail.