chore(deps): Update some dependencies, add Node 20 to CI

[dpogue]

Description

• Added Node 20 to the CI testing matrix
• Updated some dependencies to the latest version
• Use built-in fs functions where possible, removing fs-extra as a dependency

Testing

• Existing test suite passes.

Checklist

• I've run the tests to see all new and existing tests pass

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.18%. Comparing base (4d5820d) to head (b5c0b81).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #116      +/-   ##
==========================================
+ Coverage   91.93%   92.18%   +0.25%     
==========================================
  Files           1        1              
  Lines          62       64       +2     
==========================================
+ Hits           57       59       +2     
  Misses          5        5              

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[erisu]

LGTM