ci: use node 18 for ci jobs

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This updates our CI to node 18 for the 2.x branch.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (46160bf) 66.20% compared to head (4407f58) 66.20%.

Additional details and impacted files

@@           Coverage Diff           @@
##              2.x   #23701   +/-   ##
=======================================
  Coverage   66.20%   66.20%           
=======================================
  Files          93       93           
  Lines        4119     4119           
  Branches     1169     1169           
=======================================
  Hits         2727     2727           
  Misses       1126     1126           
  Partials      266      266           

Flag	Coverage Δ
unittests	66.20% <ø> (ø)

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