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/v1/spec_decode/test_eagle.py

@@ -1,7 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
-from typing import Optional
 from unittest import mock
 
 import pytest
@@ -39,7 +38,7 @@ eagle3_dir = "yuhuili/EAGLE3-LLaMA3.1-Instruct-8B"
 def _create_proposer(
     method: str,
     num_speculative_tokens: int,
-    speculative_token_tree: Optional[list[tuple[int, ...]]] = None,
+    speculative_token_tree: list[tuple[int, ...]] | None = None,
 ) -> EagleProposer:
     model_config = ModelConfig(model=model_dir, runner="generate", max_model_len=100)