Update actions to Node 20

[somewhatabstract]

This updates ancesdir to Node 20, deprecating Node 16 and Node 18. It also updates a variety of development dependencies.

[changeset-bot]

🦋 Changeset detected

Latest commit: e852206

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
ancesdir	Major

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (fc7d02b) to head (e852206).
Report is 197 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1464   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           32        32           
  Branches         8         8           
=========================================
  Hits            32        32           

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