Enforce strict types and final class in User model.

app/Models/User.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace App\Models;
 
@@ -9,7 +9,7 @@ use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Laravel\Sanctum\HasApiTokens;
 
-class User extends Authenticatable
+final class User extends Authenticatable
 {
     use HasApiTokens, HasFactory, Notifiable, SoftDeletes;