Fix Set wrapper type so you can have an array of wrappers

[Tobbe]

Fixes #9313

See the linked issue for details, but in short this PR lets you do this without type errors (notice the array of wrappers):

const Routes = () => {
  return (
    <Router>
      <Set wrap={[Wrapper]}>
        <Route path="/" page={HomePage} name="home" />
      </Set>
      <Route notfound page={NotFoundPage} />
    </Router>
  )
}

NOTE
This could technically be considered a breaking change.
People might have worked around this issue using // @ts-expect-error - wrapper types are broken. For those users that comment would possibly now break their builds because there's no error to expect anymore.