Update actions checkout and codecov

[HDauven]

Resolves #827

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.32%. Comparing base (c77deac) to head (d1dd8f4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #828   +/-   ##
=======================================
  Coverage   85.32%   85.32%           
=======================================
  Files          57       57           
  Lines        3687     3687           
=======================================
  Hits         3146     3146           
  Misses        541      541           

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