[Refactor] Customize runner type

[yezhen17]

Refer to open-mmlab/mmdetection#4570.

[codecov]

Codecov Report

Merging #437 (07d0bfe) into master (e37f5d5) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 07d0bfe differs from pull request most recent head 12a1ee0. Consider uploading reports for the commit 12a1ee0 to get more accurate results

@@           Coverage Diff           @@
##           master     #437   +/-   ##
=======================================
  Coverage   50.76%   50.76%           
=======================================
  Files         185      185           
  Lines       13581    13581           
  Branches     2177     2177           
=======================================
  Hits         6894     6894           
  Misses       6222     6222           
  Partials      465      465           

Flag	Coverage Δ
unittests	50.76% <100.00%> (ø)

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

Impacted Files	Coverage Δ
mmdet3d/__init__.py	77.27% <100.00%> (ø)

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[yezhen17]

Updated the mmdet version requirements.