[Enhancement] Upgrade isort in pre-commit hook

[MeowZheng]

Modification

1. Remove seed-isort-config in pre-commit hook
2. Upgrade isort to v5.10.1 (latest version)
3. Replace known_standard_library with extra_standard_library

[codecov]

Codecov Report

Merging #87 (249bfba) into master (0523c58) will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   67.80%   67.88%   +0.08%     
==========================================
  Files          86       86              
  Lines        4895     4895              
  Branches      705      705              
==========================================
+ Hits         3319     3323       +4     
+ Misses       1468     1464       -4     
  Partials      108      108              

Flag	Coverage Δ
unittests	67.88% <ø> (+0.08%)	⬆️

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Impacted Files	Coverage Δ
mmflow/datasets/pipelines/transforms.py	78.66% <0.00%> (+0.66%)	⬆️

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[MeowZheng]

Why replace known_standard_library with extra_standard_library?

ref: https://pycqa.github.io/isort/docs/upgrade_guides/5.0.0.html