Upgrade GitHub Actions checkout@v4

[cclauss]

https://github.com/actions/checkout/releases -->

DeprecationWarning: pkg_resources is deprecated as an API.
See https://setuptools.pypa.io/en/latest/pkg_resources.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (728752d) 62.00% compared to head (690b5b0) 62.00%.

❗ Current head 690b5b0 differs from pull request most recent head 839e916. Consider uploading reports for the commit 839e916 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #250   +/-   ##
=======================================
  Coverage   62.00%   62.00%           
=======================================
  Files          29       29           
  Lines        2858     2858           
  Branches      386      386           
=======================================
  Hits         1772     1772           
  Misses        998      998           
  Partials       88       88           

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[ionelmc]

Yeah there should be an exception for that in pytest.ini. Also .github/workflows/github-actions.yml is generated (from ci/templates/.github/workflows/github-actions.yml).