[Fix] Recheck import sorting (#1242)

* fix missed mmcv

* reinstall pre-commit and recheck

mmdet3d/utils/setup_env.py

 # Copyright (c) OpenMMLab. All rights reserved.
-import cv2
 import os
 import platform
 import warnings
+
+import cv2
 from torch import multiprocessing as mp
 
 

tests/test_utils/test_setup_env.py

 # Copyright (c) OpenMMLab. All rights reserved.
-import cv2
 import multiprocessing as mp
 import os
 import platform
+
+import cv2
 from mmcv import Config
 
 from mmdet3d.utils import setup_multi_processes

tools/data_converter/kitti_data_utils.py

@@ -4,6 +4,7 @@ from concurrent import futures as futures
 from os import path as osp
 from pathlib import Path
 
+import mmcv
 import numpy as np
 from skimage import io