Update to NodeJS v20... or maybe even Bun...

[wincent]

Would have gone all the way from v14 to v18 in one step, but had to stop at v16 instead:

• https://github.com/wincent/masochist/issues/179

This is blocked by:

• https://github.com/wincent/masochist/issues/175

Because Amazon Linux 2 has an older glibc version, as detailed in this comment.

At the time of writing, the package list shows 2023 has 18.18.2.

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Note: I might also end up switching to Bun, given my recent experiments with it on the next branch.