Bump version to v0.24.1

[mzr1996]

Please check the release note.

[codecov]

Codecov Report

Base: 86.02% // Head: 86.02% // No change to project coverage 👍

Coverage data is based on head (7cbc555) compared to base (17ed870).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1150   +/-   ##
=======================================
  Coverage   86.02%   86.02%           
=======================================
  Files         142      142           
  Lines        9906     9906           
  Branches     1715     1715           
=======================================
  Hits         8522     8522           
  Misses       1122     1122           
  Partials      262      262           

Flag	Coverage Δ
unittests	85.95% <100.00%> (ø)

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

Impacted Files	Coverage Δ
mmcls/__init__.py	89.65% <100.00%> (ø)
mmcls/version.py	61.53% <100.00%> (ø)

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[tonysy]

LGTM