Bump to node v20

[johlju]

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.24%. Comparing base (513f411) to head (c41a20b).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #47   +/-   ##
=======================================
  Coverage   93.24%   93.24%           
=======================================
  Files           5        5           
  Lines          74       74           
  Branches       12       12           
=======================================
  Hits           69       69           
  Misses          5        5           

Flag	Coverage Δ
unittests	93.24% <ø> (ø)

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