Remove git hash in __version__

[ZwwWayne]

No description provided.

[codecov]

Codecov Report

Merging #3466 into master will increase coverage by 0.02%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master    #3466      +/-   ##
==========================================
+ Coverage   58.78%   58.81%   +0.02%     
==========================================
  Files         203      204       +1     
  Lines       13569    13586      +17     
  Branches     2293     2296       +3     
==========================================
+ Hits         7977     7990      +13     
- Misses       5221     5225       +4     
  Partials      371      371              

Flag	Coverage Δ
#unittests	58.81% <77.77%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
mmdet/ops/__init__.py	0.00% <0.00%> (ø)
mmdet/utils/collect_env.py	22.91% <0.00%> (ø)
mmdet/__init__.py	94.11% <93.33%> (-5.89%)	⬇️
mmdet/models/detectors/cornernet.py	94.87% <0.00%> (-5.13%)	⬇️
mmdet/models/dense_heads/corner_head.py	74.09% <0.00%> (-1.95%)	⬇️
mmdet/models/roi_heads/test_mixins.py	53.76% <0.00%> (+5.37%)	⬆️
mmdet/models/roi_heads/mask_scoring_roi_head.py	100.00% <0.00%> (+7.89%)	⬆️

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