fix: update actions/checkout action to v3 - abandoned

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v2 -> v3

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[codecov]

Codecov Report

Merging #86 (baca801) into master (954ff40) will not change coverage.
The diff coverage is n/a.

❗ Current head baca801 differs from pull request most recent head d109335. Consider uploading reports for the commit d109335 to get more accurate results

@@            Coverage Diff            @@
##            master       #86   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           18        18           
=========================================
  Hits            18        18           

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