`Clerk` import moved under `/server`

The Clerk import path has changed from @clerk/nextjs to @clerk/nextjs/server, as this is a helper that should be only used on the server side. You must update your import path in order for it to work correctly. Note as well that the Clerk export has changed to createClerkClient as part of the v5 changes. Example below of the fix that needs to be made:

- import { Clerk } from "@clerk/nextjs"
+ import { createClerkClient } from "@clerk/nextjs/server"