[Fix]Fix mmcv version 2.0.0rc3 for win test

[MeowZheng]

as title

[codecov]

Codecov Report

Base: 83.31% // Head: 83.40% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (388578b) compared to base (74e8b89).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2531      +/-   ##
===========================================
+ Coverage    83.31%   83.40%   +0.09%     
===========================================
  Files          145      145              
  Lines         8510     8510              
  Branches      1274     1274              
===========================================
+ Hits          7090     7098       +8     
+ Misses        1208     1198      -10     
- Partials       212      214       +2     

Flag	Coverage Δ
unittests	83.40% <ø> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
mmseg/datasets/transforms/transforms.py	90.40% <0.00%> (+0.90%)	⬆️
mmseg/datasets/basesegdataset.py	100.00% <0.00%> (+1.02%)	⬆️

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