Update Optional[x] -> x | None and Union[x, y] to x | y (#26633)

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

tests/entrypoints/openai/test_lora_resolvers.py

@@ -4,7 +4,6 @@
 from contextlib import suppress
 from dataclasses import dataclass, field
 from http import HTTPStatus
-from typing import Optional
 from unittest.mock import AsyncMock, MagicMock
 
 import pytest
@@ -38,13 +37,13 @@ class MockModelConfig:
     trust_remote_code: bool = False
     tokenizer_mode: str = "auto"
     max_model_len: int = 100
-    tokenizer_revision: Optional[str] = None
+    tokenizer_revision: str | None = None
     multimodal_config: MultiModalConfig = field(default_factory=MultiModalConfig)
     hf_config: MockHFConfig = field(default_factory=MockHFConfig)
-    logits_processor_pattern: Optional[str] = None
-    diff_sampling_param: Optional[dict] = None
+    logits_processor_pattern: str | None = 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"
     skip_tokenizer_init: bool = False
@@ -56,7 +55,7 @@ class MockModelConfig:
 class MockLoRAResolver(LoRAResolver):
     async def resolve_lora(
         self, base_model_name: str, lora_name: str
-    ) -> Optional[LoRARequest]:
+    ) -> LoRARequest | None:
         if lora_name == "test-lora":
             return LoRARequest(
                 lora_name="test-lora",