Upgrade @headlessui/react to latest

[Sendouc]

Some API changes.

Should do manual validation on the UI elements that it still works the same after upgrade (as well as fixing the type errors etc.)

[ElementUser]

Left a comment in my MR, but copy-pasting it here just in case (with regards to the "left-shifting" issue):

So I took a look at the @headlessui/react Repo and it is a confirmed issue with the version of the library itself. Someone else reported a bug that is very similar to this (very likely the same issue): tailwindlabs/headlessui#3396

So it's best to not proceed with the upgrade until they fix it in a later version. However, we can keep an eye on this linked Github issue at least =)