Convert formatting to use ruff instead of yapf + isort (#26247)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

benchmarks/benchmark_serving_structured_output.py

@@ -37,14 +37,13 @@ from typing import Optional
 import datasets
 import numpy as np
 import pandas as pd
-from tqdm.asyncio import tqdm
-from transformers import PreTrainedTokenizerBase
-
 from backend_request_func import (
     ASYNC_REQUEST_FUNCS,
     RequestFuncInput,
     RequestFuncOutput,
 )
+from tqdm.asyncio import tqdm
+from transformers import PreTrainedTokenizerBase
 
 try:
     from vllm.transformers_utils.tokenizer import get_tokenizer