fix(ts): remove TS workaround for withAuth

[balazsorban44]

Removes workaround for typing withAuth's inner Middleware. Closes #4925. Fixes #4817.

We control what happens inside withAuth so we shouldn't require the user to type anything themselves.

This is now correctly typed:

import { withAuth } from "next-auth/middleware"

export default withAuth(
  function middleware(req) {
    console.log(req.nextauth.token)
  }
)

// or

export default withAuth((req) => {
  console.log(req.nextauth.token)
})

I also noticed that NextMiddleware could not return void which I opened a PR for upstream in Next.js vercel/next.js#38625

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated
next-auth	⬜️ Ignored (Inspect)		Jul 14, 2022 at 11:17PM (UTC)

[github-actions]

🎉 Experimental release published on npm!

npm i next-auth@0.0.0-pr.4926.25a4fa9f

yarn add next-auth@0.0.0-pr.4926.25a4fa9f

[ThangHuuVu]

Lgtm! 🙌