Update @xstyled/styled-components

[good-idea]

I believe that it's the older version of the package that is causing hydration errors. I also wrote the typescript definitions, back before the package supplied their own. The API has changed (there's no more Box export), so updating this will be a lengthy, but likely simple, refactoring chore.

[beelaineo]

@good-idea I'll add this to the kanban as something that should be approved