Infra: Upgrade deps

[ryan-roemer]

• Internal: Misc dependency updates.
• Infra: Upgrade mock-fs and enabled Node 16.3+. Fixes Test: Node v16.3.0 breaks mock-fs #61
• Note: eslint8 upgrade skipped due to: Bug: using babel-eslint parser throws error eslint/eslint#15157

[codecov-commenter]

Codecov Report

Merging #66 (0743d5c) into main (5faa9c3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #66   +/-   ##
=======================================
  Coverage   98.50%   98.50%           
=======================================
  Files           6        6           
  Lines         335      335           
=======================================
  Hits          330      330           
  Misses          5        5           

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