chore(deps): Upgrade to latest Capsize packages

[michaeltaranto]

🔗 Linked issue

First step relating to this discussion.

Closes #317 and #318 (auto-generated PRs)

❓ Type of change

Open to discussing this one, selecting chore for now.

• 📖 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

Upgrading to the latest Capsize packages. This upgrade provides a few key benefits to the Fontaine 🤝 Capsize relationship:

• Improved ESM compatibility
• Improved types, with consumers encouraged to adopt a moduleResolution strategy that understands the package.json exports key, e.g. Bundler.
• Updated xWidthAvg metric, now calculated from more extendable dataset (rather than hard coded English character frequencies) in preparation for supporting other unicode subsets, e.g. Thai.
  This is a move away from the original character frequencies collaborated on with the Google Aurora team, and seem to perform same or better, while also having the benefit of no longer being hard coded. As a result the snapshots of metrics and CSS have changed, but here is a visual example of the change to IBM Plex Mono (used in one of the snapshots):

No Capsize:

With Capsize v1:

With Capsize v2:

Note also upgrading to Node 18 in CI due to missing fetch API. Hopefully thats ok given Node 16s move to EOL

📝 Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.01%. Comparing base (7fea517) to head (e8bc9e3).
Report is 5 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##              main     #319       +/-   ##
============================================
- Coverage   100.00%   54.01%   -45.99%     
============================================
  Files            2        4        +2     
  Lines          197      361      +164     
  Branches        31       33        +2     
============================================
- Hits           197      195        -2     
- Misses           0      166      +166     

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[michaeltaranto]

It doesnt seem like the codecov bot has run since the action was updated, resulting in this PR showing a failed result 🤔 .

[danielroe]

Thank you ❤️ This is great, and really appreciate you taking the time.