await createClient() promise in AuthButton.tsx (#30909)

examples/auth/nextjs/components/AuthButton.tsx

@@ -12,7 +12,7 @@ export default async function AuthButton() {
   const signOut = async () => {
     'use server'
 
-    const supabase = createClient()
+    const supabase = await createClient()
     await supabase.auth.signOut()
     return redirect('/login')
   }