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

[dpogue]

Platforms affected

All

Motivation and Context

Update some dependencies, but very minimally. This package appears to still support Node 14, and I don't want to drop that and have to do a major version bump right now, so I pretty much just ran npm audit fix 😕

Description

• Fix GitHub Actions warnings about old actions versions
• Resolve npm security audit warnings
• Added Node 20.x to CI matrix

Testing

Unit tests all pass in CI.

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 27.98%. Comparing base (9dce9f1) to head (ff2d018).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #57   +/-   ##
=======================================
  Coverage   27.98%   27.98%           
=======================================
  Files           6        6           
  Lines         218      218           
=======================================
  Hits           61       61           
  Misses        157      157           

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[erisu]

LGTM