feat: ✨ Upgrade across the board to Node 18.

[JamesIves]

Description

Upgrades across the board to Node 18 LTS. This is potentially a breaking change for some workflows, and thus will be considered a major version change.

Testing Instructions

N/A

Additional Notes

N/A

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.90%. Comparing base (7e13873) to head (6353401).
Report is 216 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1398   +/-   ##
=======================================
  Coverage   97.90%   97.90%           
=======================================
  Files           7        7           
  Lines         286      286           
  Branches       77       77           
=======================================
  Hits          280      280           
  Misses          6        6           

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