Update GH actions versions in workflows

[browniebroke]

Fix warnings:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.23%. Comparing base (639de87) to head (d5705c7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #189   +/-   ##
=======================================
  Coverage   98.23%   98.23%           
=======================================
  Files           3        3           
  Lines         227      227           
=======================================
  Hits          223      223           
  Misses          4        4           

Flag	Coverage Δ
unittests	98.23% <ø> (ø)

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