Action updates

[arnested]

• Use actions/setup-go
• Use newest Ubuntu as action runner

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 28.32%. Comparing base (f1cf73a) to head (41a4e7b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #461   +/-   ##
=======================================
  Coverage   28.32%   28.32%           
=======================================
  Files           7        7           
  Lines         286      286           
=======================================
  Hits           81       81           
  Misses        203      203           
  Partials        2        2           

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