[CI] Fix win ci

[xiexinch]

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Motivation

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Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMDet3D.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Base: 83.53% // Head: 83.56% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (c5b5c77) compared to base (f3cd44b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2202      +/-   ##
===========================================
+ Coverage    83.53%   83.56%   +0.02%     
===========================================
  Files          138      138              
  Lines         7792     7792              
  Branches      1167     1167              
===========================================
+ Hits          6509     6511       +2     
+ Misses        1106     1104       -2     
  Partials       177      177              

Flag	Coverage Δ
unittests	83.56% <ø> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
mmseg/models/backbones/timm_backbone.py	45.83% <0.00%> (+8.33%)	⬆️

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