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/Library.php

@@ -6,7 +6,6 @@ use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
-use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Library extends Model
 {
@@ -14,23 +13,25 @@ class Library 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',
+        'id' => 'integer',
         'language_codes' => 'array',
     ];
 
     protected static function booted()
     {
         static::creating(function ($model) {
-            if (!$model->created_by) {
+            if (! $model->created_by) {
                 $model->created_by = auth()->id();
             }
         });
@@ -46,7 +47,7 @@ class Library extends Model
         return $this->belongsToMany(LibraryItem::class);
     }
 
-    public function parent() : BelongsTo
+    public function parent(): BelongsTo
     {
         return $this->belongsTo(__CLASS__, 'parent_id');
     }