Add explicit Node.js 22 support and testing

[davidjgoss]

🤔 What's changed?

Node.js 22 is now the "current" version. So, this PR adds it to the list of tested versions, and updates GitHub actions to include it in our OS/version matrix.

Also, all the more general workflows are updated to use 22 as well, since it makes sense to exercise the current version where no specific one is needed.

Finally, fix up the changelog a bit while we're here.

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

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[coveralls]

coverage: 98.234%. remained the same
when pulling 524afff on feat/node-22
into a28dc9b on main.

[davidjgoss]

Released in https://github.com/cucumber/cucumber-js/releases/tag/v10.7.0