chore: upgrade from Node.js v18 to v20

[chrisvogt]

This PR upgrade Node to the current LTS version.

https://nodejs.org/dist/latest-v20.x/docs/api/

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[codecov]

Codecov Report

Merging #172 (5719996) into main (0422ead) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #172   +/-   ##
=======================================
  Coverage   65.66%   65.66%           
=======================================
  Files          65       65           
  Lines         597      597           
  Branches      156      156           
=======================================
  Hits          392      392           
  Misses        192      192           
  Partials       13       13           

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