[Fix] np.int is deprecated

[MeowZheng]

as title
https://numpy.org/devdocs/release/1.20.0-notes.html

[codecov]

Codecov Report

Base: 69.23% // Head: 69.08% // Decreases project coverage by -0.15% ⚠️

Coverage data is based on head (8b80235) compared to base (37be893).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #270      +/-   ##
==========================================
- Coverage   69.23%   69.08%   -0.16%     
==========================================
  Files          93       93              
  Lines        5195     5195              
  Branches      700      700              
==========================================
- Hits         3597     3589       -8     
- Misses       1484     1491       +7     
- Partials      114      115       +1     

Flag	Coverage Δ
unittests	69.08% <100.00%> (-0.16%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmflow/datasets/utils/image.py	88.23% <100.00%> (ø)
mmflow/utils/misc.py	95.23% <0.00%> (-4.77%)	⬇️
mmflow/datasets/pipelines/transforms.py	79.33% <0.00%> (-1.17%)	⬇️

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