Upgrade to Laravel 9 (#4413)

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

app/Contracts/Criteria/CriteriaInterface.php

@@ -1,24 +1,14 @@
 <?php
-/**
- * Pterodactyl - Panel
- * Copyright (c) 2015 - 2017 Dane Everitt <dane@daneeveritt.com>.
- *
- * This software is licensed under the terms of the MIT license.
- * https://opensource.org/licenses/MIT
- */
 
 namespace Pterodactyl\Contracts\Criteria;
 
+use Illuminate\Database\Eloquent\Model;
 use Pterodactyl\Repositories\Repository;
 
 interface CriteriaInterface
 {
     /**
      * Apply selected criteria to a repository call.
-     *
-     * @param \Illuminate\Database\Eloquent\Model $model
-     *
-     * @return mixed
      */
-    public function apply($model, Repository $repository);
+    public function apply(Model $model, Repository $repository): mixed;
 }