test: Add Node 20 to CI matrix

[BilalQamar95]

Description

As a first step in the upgrade to Node 20, add it to the CI matrix as a non-blocking test.

See the tracking issue for further information.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.80%. Comparing base (9be2cd4) to head (4d1bfc9).
Report is 16 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   96.53%   97.80%   +1.27%     
==========================================
  Files          10       10              
  Lines         173      228      +55     
  Branches       35       55      +20     
==========================================
+ Hits          167      223      +56     
+ Misses          5        4       -1     
  Partials        1        1              

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