chore: fix phpstan errors

src/BusProNet/XmlLoader/HotelLoader.php

@@ -11,6 +11,7 @@ use Symfony\Contracts\Cache\ItemInterface;
 
 class HotelLoader extends AbstractLoader
 {
+    /** @return array<int, Hotel> */
     public function loadAll(?string $filename = 'hotel.xml'): array
     {
         try {