build: Upgrade to Node 20

[Anas12091101]

As a second step in the Node 20 upgrade process, upgrade .nvmrc and regenerate package-lock.json from scratch using Node 20. Also make the Node 20 test a blocking one.

See the tracking issue for futher information.

[openedx-webhooks]

Thanks for the pull request, @Anas12091101!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.26%. Comparing base (ef6ade6) to head (ca55029).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #211   +/-   ##
=======================================
  Coverage   83.26%   83.26%           
=======================================
  Files          47       47           
  Lines         693      693           
  Branches      136      135    -1     
=======================================
  Hits          577      577           
  Misses        116      116           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Anas12091101]

@brian-smith-tcril, thank you for merging the first PR. Could you please help with reviewing and merging this PR as well?

[Anas12091101]

Hi @brian-smith-tcril, just a friendly reminder about this PR when you have a moment. Appreciate your help, thank you!