Upgrade to Laravel 9 (#4413)

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

app/Http/Requests/Admin/DatabaseHostFormRequest.php

@@ -3,13 +3,11 @@
 namespace Pterodactyl\Http\Requests\Admin;
 
 use Pterodactyl\Models\DatabaseHost;
+use Illuminate\Contracts\Validation\Validator;
 
 class DatabaseHostFormRequest extends AdminFormRequest
 {
-    /**
-     * @return mixed
-     */
-    public function rules()
+    public function rules(): array
     {
         if ($this->method() !== 'POST') {
             return DatabaseHost::getRulesForUpdate($this->route()->parameter('host'));
@@ -20,10 +18,8 @@ class DatabaseHostFormRequest extends AdminFormRequest
 
     /**
      * Modify submitted data before it is passed off to the validator.
-     *
-     * @return \Illuminate\Contracts\Validation\Validator
      */
-    protected function getValidatorInstance()
+    protected function getValidatorInstance(): Validator
     {
         if (!$this->filled('node_id')) {
             $this->merge(['node_id' => null]);