[Lint]Style: Convert example to ruff format (#5863)

### What this PR does / why we need it?
This PR fixes linting issues in the `example/` to align with the
project's Ruff configuration.

- vLLM version: v0.13.0
- vLLM main:
bde38c11df

Signed-off-by: root <root@LAPTOP-VQKDDVMG.localdomain>
Co-authored-by: root <root@LAPTOP-VQKDDVMG.localdomain>

examples/quantization/llm-compressor/w8a8_int8_dynamic.py

@@ -1,10 +1,9 @@
 from datasets import load_dataset
-from transformers import AutoModelForCausalLM, AutoTokenizer
-
 from llmcompressor import oneshot
 from llmcompressor.modifiers.quantization import GPTQModifier
 from llmcompressor.modifiers.smoothquant import SmoothQuantModifier
 from llmcompressor.utils import dispatch_for_generation
+from transformers import AutoModelForCausalLM, AutoTokenizer
 
 # Select model and load it.
 MODEL_ID = "meta-llama/Meta-Llama-3-8B-Instruct"
@@ -80,4 +79,4 @@ print("==========================================\n\n")
 # Save to disk compressed.
 SAVE_DIR = MODEL_ID.rstrip("/").split("/")[-1] + "-W8A8-Dynamic-Per-Token"
 model.save_pretrained(SAVE_DIR, save_compressed=True)
-tokenizer.save_pretrained(SAVE_DIR)
+tokenizer.save_pretrained(SAVE_DIR)