Adapt with new next-auth version

pages/api/auth/[...nextauth].js

@@ -1,10 +1,10 @@
 import NextAuth from 'next-auth'
-import Providers from 'next-auth/providers'
+import CredentialsProvider from 'next-auth/providers/credentials'
 import axios from 'axios'
 
 const options = {
   providers: [
-    Providers.Credentials({
+    CredentialsProvider({
       name: 'Credentials',
       credentials: {
         username: {label: 'Email', type: 'email', placeholder: 'email@exemple.net'},
@@ -28,8 +28,9 @@ const options = {
       }
     })
   ],
+  secret: process.env.NEXT_PUBLIC_JWT_SECRET,
   session: {
-    jwt: true
+    strategy: 'jwt'
   },
   pages: {
     signIn: '/soumet',