Bump NodeJS to version 20

[felddy]

🗣 Description

This bumps the NodeJS version to 20.

💭 Motivation and context

Version 20 of NodeJS has been approved by the FoundryVTT developers.
There is evidence that v20 may also mitigate some of the glibc issues people are having with embedded database binaries.
See:

• Node segfault (error 139) in container release v11.x.x #697

🧪 Testing

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• All new and existing tests pass.

[felddy]

It's been over a year since npm started hanging on NodeJS. It does not look a resolution is forthcoming. FoundryVTT v13 will require at least Node 20. The best way forward seems to convert the image base from Alpine to Debian. I will start this work in a new branch, and PR.

See:

• npm hangs on some architectures of Alpine Linux npm-hang-test#2
• https://foundryvtt.com/releases/13.332