Upgrade npm deps to address high-sev vulnerabilities (fixes #118)

[benvinegar]

Done by running npm audit fix and quickly verifying everything works in production (on a preview branch).

Before:

20 vulnerabilities (11 low, 4 moderate, 5 high)

After:

10 low severity vulnerabilities

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.49%. Comparing base (b88fca8) to head (4b8803d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #131   +/-   ##
=======================================
  Coverage   78.49%   78.49%           
=======================================
  Files          34       34           
  Lines        2488     2488           
  Branches      266      266           
=======================================
  Hits         1953     1953           
  Misses        526      526           
  Partials        9        9           

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