[Chore] Update yarn to v4.6.0

[Philzen]

This updates the whole stack (incl. create-redwood-app) to the latest version of Yarn.

[Tobbe]

@Philzen Can you please update the PR description?
And just to double check, these changes should not have any affect on existing RW projects, right?

Or, well, I guess, technically if someone was doing yarn create redwood-app in their own CI things would change because it would now be yarn 4.6 instead of 4.4. But no one does that? Right? 😰 😀

[Philzen]

@Philzen Can you please update the PR description?

Done.

And just to double check, these changes should not have any affect on existing RW projects, right?

I wouldn't think so – as one can see from the yarn.lock diffs, the resolutions are identical, only a newer hash for the Typescript version, which won't have an effect on RW projects consuming the compiled npm package.

Actually, i was intending this for the next minor or major version... otherwise, technically, the upgrade guide would need to be amended to suggest upgrading to yarn 4.6 i guess ;)