Update deprecated Python 3.8 typing (#13971)

tests/v1/engine/test_llm_engine.py

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 import random
-from typing import Dict, List, Optional, Tuple
+from typing import Optional
 
 import pytest
 
@@ -47,9 +47,9 @@ def vllm_model_apc(vllm_runner, monkeypatch):
 
 
 def _get_test_sampling_params(
-    prompt_list: List[str],
+    prompt_list: list[str],
     seed: Optional[int] = 42,
-) -> Tuple[List[SamplingParams], List[int]]:
+) -> tuple[list[SamplingParams], list[int]]:
     """Generate random sampling params for a batch."""
 
     def get_mostly_n_gt1() -> int:
@@ -81,7 +81,7 @@ def test_parallel_sampling(vllm_model, example_prompts) -> None:
 
     # Validate each request response
     for out, n in zip(outputs, n_list):
-        completion_counts: Dict[str, int] = {}
+        completion_counts: dict[str, int] = {}
         # Assert correct number of completions
         assert len(out.outputs) == n, (
             f"{len(out.outputs)} completions; {n} expected.")