Apply Laravel coding style

Shift automatically applies the Laravel coding style - which uses the PSR-12 coding style as a base with some minor additions.

You may customize the code style applied by configuring [Pint](https://laravel.com/docs/pint), [PHP CS Fixer](https://github.com/FriendsOfPHP/PHP-CS-Fixer), or [PHP CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) for your project root.

For more information on customizing the code style applied by Shift, [watch this short video](https://laravelshift.com/videos/shift-code-style).

app/Models/Registration.php

@@ -12,19 +12,21 @@ class Registration extends Model
 
     /**
      * The attributes that aren't mass assignable.
+     *
      * @var array
      */
     protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.
+     *
      * @var array
      */
     protected $casts = [
-        'id'             => 'integer',
-        'event_id'       => 'integer',
+        'id' => 'integer',
+        'event_id' => 'integer',
         'participant_id' => 'integer',
-        'active'         => 'boolean',
+        'active' => 'boolean',
     ];
 
     public function courseEvent(): BelongsTo