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 87.03%. Comparing base (52022b5) to head (d1ecb34).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #36   +/-   ##
=======================================
  Coverage   87.03%   87.03%           
=======================================
  Files           7        7           
  Lines          54       54           
  Branches        5        5           
=======================================
  Hits           47       47           
  Misses          7        7           

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