Upgrade to Laravel 9 (#4413)

Co-authored-by: DaneEveritt <dane@daneeveritt.com>

app/Notifications/AccountCreated.php

@@ -12,50 +12,25 @@ class AccountCreated extends Notification implements ShouldQueue
 {
     use Queueable;
 
-    /**
-     * The authentication token to be used for the user to set their
-     * password for the first time.
-     *
-     * @var string|null
-     */
-    public $token;
-
-    /**
-     * The user model for the created user.
-     *
-     * @var \Pterodactyl\Models\User
-     */
-    public $user;
-
     /**
      * Create a new notification instance.
      */
-    public function __construct(User $user, string $token = null)
+    public function __construct(public User $user, public ?string $token = null)
     {
-        $this->token = $token;
-        $this->user = $user;
     }
 
     /**
      * Get the notification's delivery channels.
-     *
-     * @param mixed $notifiable
-     *
-     * @return array
      */
-    public function via($notifiable)
+    public function via(): array
     {
         return ['mail'];
     }
 
     /**
      * Get the mail representation of the notification.
-     *
-     * @param mixed $notifiable
-     *
-     * @return \Illuminate\Notifications\Messages\MailMessage
      */
-    public function toMail($notifiable)
+    public function toMail(): MailMessage
     {
         $message = (new MailMessage())
             ->greeting('Hello ' . $this->user->name . '!')