Adding Node.js 20 run image on stacks

[pacostas]

Summary

This PR adds the Paketo UBI run images for Node.js 20.

Use Cases

Checklist

• [x] I have viewed, signed, and submitted the Contributor License Agreement.
• [ ] I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• [x] I have added an integration test, if necessary.
• [x] I have reviewed the styleguide for guidance on my code quality.
• [x] I'm happy with the commit history on this PR (I have rebased/squashed as needed).

[pacostas]

@sophiewigmore Thank you :)