[Improve] Skip problematic opencv-python versions

[wangruohui]

Try fix #830
Wait until next release of opencv-python

[codecov]

Codecov Report

Merging #833 (f8ebbf7) into master (b83bdea) will increase coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #833      +/-   ##
==========================================
+ Coverage   83.19%   83.51%   +0.32%     
==========================================
  Files         220      222       +2     
  Lines       12441    12813     +372     
  Branches     2012     2094      +82     
==========================================
+ Hits        10350    10701     +351     
- Misses       1774     1783       +9     
- Partials      317      329      +12     

Flag	Coverage Δ
unittests	83.47% <ø> (+0.32%)	⬆️

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

Impacted Files	Coverage Δ
mmedit/apis/inpainting_inference.py	25.00% <0.00%> (-5.77%)	⬇️
...edit/models/backbones/vfi_backbones/tof_vfi_net.py	94.18% <0.00%> (-4.66%)	⬇️
mmedit/apis/matting_inference.py	37.20% <0.00%> (-1.82%)	⬇️
mmedit/apis/generation_inference.py	21.42% <0.00%> (-1.65%)	⬇️
mmedit/apis/restoration_inference.py	14.28% <0.00%> (-1.10%)	⬇️
mmedit/apis/restoration_face_inference.py	21.27% <0.00%> (-0.95%)	⬇️
mmedit/core/evaluation/eval_hooks.py	61.53% <0.00%> (-0.63%)	⬇️
mmedit/datasets/__init__.py	100.00% <0.00%> (ø)
mmedit/models/common/flow_warp.py	100.00% <0.00%> (ø)
mmedit/models/backbones/vfi_backbones/__init__.py	100.00% <0.00%> (ø)
... and 8 more

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