feat(deps)!: update Node.js to v20

[Anemy]

Re @addaleax's comment, let's wait until mongosh is on node 22 before we merge this.
*edit, we can go to 20 and add this testing as Anna suggested, will update.

[Anemy]

Looks like these tests don't cleanup fully. To prevent them running 360 minutes I'm adding this. Not fixing the root in these changes, likely that'll be saved for another time.

[addaleax]

Should this be a breaking change as it's in the package.json? feat!

Yeah, bumping the minimum Node.js requirement is definitely a feat!.

Practically speaking, I don't think we can bump to 22 yet, not until mongosh is also at a newer (20+) version of Node.js. That will likely happen later this year, though.

[addaleax]

@Anemy You could lower the target to 20.x and add testing for 22.x and 24.x – would that work for now?

[addaleax]

@Anemy took the liberty to push a commit to change the minimum to the latest 20.x

[Anemy]

Changes look good @addaleax, I can't explicitly approve as I'm the author, so this is my approval. Most recent tests look like npm connectivity failures, they did pass in the last run and the most recent commit shouldn't change that from what I can tell.