Fix per file ruff ignores related to typing (#26254)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

tests/entrypoints/openai/test_serving_chat.py

@@ -6,7 +6,7 @@ from __future__ import annotations
 import asyncio
 from contextlib import suppress
 from dataclasses import dataclass, field
-from typing import TYPE_CHECKING, Any, Optional
+from typing import TYPE_CHECKING, Any
 from unittest.mock import AsyncMock, MagicMock
 
 import pytest
@@ -233,9 +233,9 @@ class MockModelConfig:
     multimodal_config = MultiModalConfig()
     hf_config = MockHFConfig()
     logits_processor_pattern = None
-    diff_sampling_param: Optional[dict] = None
+    diff_sampling_param: dict | None = None
     allowed_local_media_path: str = ""
-    allowed_media_domains: Optional[list[str]] = None
+    allowed_media_domains: list[str] | None = None
     encoder_config = None
     generation_config: str = "auto"
     media_io_kwargs: dict[str, dict[str, Any]] = field(default_factory=dict)