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/kernels/moe/modular_kernel_tools/profile_modular_kernel.py

@@ -2,8 +2,9 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import copy
+from collections.abc import Callable
 from itertools import product
-from typing import Any, Callable
+from typing import Any
 
 import torch