tests(integration): fix new tests using legacy factories

app/Models/Backup.php

@@ -3,6 +3,7 @@
 namespace Pterodactyl\Models;
 
 use Illuminate\Database\Eloquent\SoftDeletes;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 
 /**
  * @property int $id
@@ -24,6 +25,7 @@ use Illuminate\Database\Eloquent\SoftDeletes;
  */
 class Backup extends Model
 {
+    use HasFactory;
     use SoftDeletes;
 
     const RESOURCE_NAME = 'backup';