Update Vite-related packages (#539)

As far as I can tell, this doesn’t seem to affect the compatibility of
the generated code: while the output changes a bit, its size is almost
identical; furthermore, the Vite changelog mentions that the nullish
coalescing operator isn’t transpiled anymore since Vite 4, but we use
such an operator in actions.ts and the corresponding build code can be
found by searching for .language.display.label, and it doesn’t appear to
have changed at all – so I think our build config is sufficiently
specific that the change to Vite’s defaults doesn’t actually change the
target version.

Bug: T348108