[Fix] fix mmcv install in CI

[kennymckormick]

No description provided.

[codecov]

Codecov Report

Merging #977 (4c42501) into master (006952d) will increase coverage by 0.45%.
The diff coverage is 87.82%.

❗ Current head 4c42501 differs from pull request most recent head d736db0. Consider uploading reports for the commit d736db0 to get more accurate results

@@            Coverage Diff             @@
##           master     #977      +/-   ##
==========================================
+ Coverage   83.21%   83.67%   +0.45%     
==========================================
  Files         129      132       +3     
  Lines        9421    10057     +636     
  Branches     1612     1733     +121     
==========================================
+ Hits         7840     8415     +575     
- Misses       1189     1221      +32     
- Partials      392      421      +29     

Flag	Coverage Δ
unittests	83.67% <87.82%> (+0.45%)	⬆️

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

Impacted Files	Coverage Δ
mmaction/apis/test.py	12.24% <0.00%> (-0.13%)	⬇️
mmaction/apis/train.py	10.18% <0.00%> (ø)
mmaction/core/evaluation/eval_hooks.py	11.17% <0.00%> (-0.59%)	⬇️
mmaction/datasets/ava_dataset.py	90.60% <ø> (ø)
mmaction/datasets/base.py	58.86% <0.00%> (-0.85%)	⬇️
mmaction/models/backbones/resnet3d_csn.py	97.36% <ø> (ø)
mmaction/models/backbones/resnet3d_slowfast.py	82.65% <ø> (ø)
mmaction/utils/decorators.py	100.00% <ø> (+6.66%)	⬆️
mmaction/models/heads/roi_head.py	75.00% <50.00%> (ø)
mmaction/models/recognizers/recognizer2d.py	84.94% <53.84%> (-5.30%)	⬇️
... and 40 more

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