upgrade codecov action

[JacksonTian]

You need to complete

• unit tests and/or feature tests
• documentation is changed or added

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.31%. Comparing base (7fca991) to head (2b49b2c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
+ Coverage   90.98%   94.31%   +3.33%     
==========================================
  Files          20       20              
  Lines        1420     1214     -206     
==========================================
- Hits         1292     1145     -147     
+ Misses        109       55      -54     
+ Partials       19       14       -5     

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