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/quantization/test_quark.py

@@ -11,7 +11,6 @@ import importlib.metadata
 import os
 from dataclasses import dataclass
 from importlib.util import find_spec
-from typing import Optional
 
 import huggingface_hub
 import lm_eval
@@ -156,8 +155,8 @@ class AccuracyTestConfig:
     def get_model_args(
         self,
         tp_size: int,
-        model_max_len: Optional[int] = None,
-        kwargs: Optional[dict] = None,
+        model_max_len: int | None = None,
+        kwargs: dict | None = None,
     ) -> dict:
         if kwargs is None:
             kwargs = {}