Upgrade to node 20

[ValentinVignal]

Fixes #12

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.27%. Comparing base (708011c) to head (c4eb769).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   66.19%   70.27%   +4.07%     
==========================================
  Files           4        4              
  Lines          71      111      +40     
  Branches       12       28      +16     
==========================================
+ Hits           47       78      +31     
- Misses         15       31      +16     
+ Partials        9        2       -7     

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