chore: update repo urls

[davidjgoss]

🤔 What's changed?

Update URLs to GitHub where they pointed at old repos/mirrors.

⚡️ What's your motivation?

Get our ducks in a row for possible future funders.

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, documentation etc. without changing behaviour)

📋 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.

---

This text was originally generated from a template, then edited by hand. You can modify the template here.

[mpkorstanje]

Looks good, but needs a changelog entry.