[Enhancement] Upgrade isort in pre-commit hook

[GT9505]

refer to open-mmlab/mmflow#87

[codecov]

Codecov Report

Merging #421 (0c62702) into master (df5bd0e) will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #421      +/-   ##
==========================================
+ Coverage   71.03%   71.11%   +0.08%     
==========================================
  Files         117      117              
  Lines        6249     6249              
  Branches     1198     1198              
==========================================
+ Hits         4439     4444       +5     
+ Misses       1451     1445       -6     
- Partials      359      360       +1     

Flag	Coverage Δ
unittests	71.05% <ø> (+0.08%)	⬆️

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Impacted Files	Coverage Δ
mmtrack/datasets/sot_train_dataset.py	81.81% <0.00%> (-4.05%)	⬇️
mmtrack/datasets/pipelines/transforms.py	87.42% <0.00%> (+2.69%)	⬆️

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