Update deprecated Python 3.8 typing (#13971)

tests/entrypoints/openai/test_chat.py

@@ -3,7 +3,7 @@
 # imports for guided decoding tests
 import json
 import re
-from typing import Dict, List, Optional
+from typing import Optional
 
 import jsonschema
 import openai  # use the official client for correctness check
@@ -190,7 +190,7 @@ async def test_too_many_chat_logprobs(client: openai.AsyncOpenAI,
 async def test_prompt_logprobs_chat(client: openai.AsyncOpenAI,
                                     model_name: str,
                                     prompt_logprobs: Optional[int]):
-    params: Dict = {
+    params: dict = {
         "messages": [{
             "role": "system",
             "content": "You are a helpful assistant."
@@ -232,7 +232,7 @@ async def test_prompt_logprobs_chat(client: openai.AsyncOpenAI,
 )
 async def test_more_than_one_prompt_logprobs_chat(client: openai.AsyncOpenAI,
                                                   model_name: str):
-    params: Dict = {
+    params: dict = {
         "messages": [{
             "role": "system",
             "content": "You are a helpful assistant."
@@ -343,7 +343,7 @@ async def test_chat_streaming(client: openai.AsyncOpenAI, model_name: str):
         temperature=0.0,
         stream=True,
     )
-    chunks: List[str] = []
+    chunks: list[str] = []
     finish_reason_count = 0
     async for chunk in stream:
         delta = chunk.choices[0].delta