chore!: drop support for Node.js 21

[mrazauskas]

Summary

Perhaps it is time to drop Node.js 21? It is end-of-life since 2024-06-01. Reference: https://github.com/nodejs/Release

Test plan

Green CI.

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[mrazauskas]

@SimenB Could you take a look, please? GHA is waiting for status checks on Node v21.x, because these are marked as required. Not so easy to remove them (;

[SimenB]

Not sure about this. It would mean people supporting >=20 wouldn't be able to use Jest. Same technically applies to >=18 already as we've dropped 19, so maybe not a big deal? And as long as we do support 18 (and 16 for that matter), the likelihood of those breaking are low.

So yeah, I think I convinved myself 😀

[mrazauskas]

I think that is fine, since Node.js does not recommend the odd versions for production anyways. Play with it, have fun, but that is it.

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