[CI] Remove unused imports with Ruff to pre-commit config, only to benchmarks/docs/examples folder (#3969)

benchmark/mmmu/bench_hf.py

@@ -1,6 +1,5 @@
 import argparse
 
-import PIL.Image
 import torch
 from data_utils import save_json
 from eval_utils import (

benchmark/mmmu/data_utils.py

@@ -5,7 +5,6 @@ import os
 import re
 
 import yaml
-from datasets import concatenate_datasets, load_dataset
 
 DOMAIN_CAT2SUB_CAT = {
     "Art and Design": ["Art", "Art_Theory", "Design", "Music"],