bump codecov/codecov-action v3

[shogo82148]

This pull request fixes the following warning:

The following actions uses node12 which is deprecated and will be forced to run on node16: codecov/codecov-action@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

[codecov[bot]]

Codecov Report

Merging #116 (92adb4a) into main (da77b46) will not change coverage. Report is 1 commits behind head on main. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #116   +/-   ##
=======================================
  Coverage   81.88%   81.88%           
=======================================
  Files           5        5           
  Lines         762      762           
=======================================
  Hits          624      624           
  Misses        114      114           
  Partials       24       24           

[seachicken]

thanks. nice work 👍