chore: fix phpstan errors

src/BusProNet/XmlLoader/PickupLoader.php

@@ -10,6 +10,7 @@ use Symfony\Contracts\Cache\ItemInterface;
 
 class PickupLoader extends AbstractLoader
 {
+    /** @return array<int|string, Pickup> */
     public function loadAll(?string $filename = 'zustiege.xml'): array
     {
         try {
@@ -65,6 +66,11 @@ class PickupLoader extends AbstractLoader
         $travel->dropOffs = $this->patchAndOrderDropOffs($travel->dropOffs, $travel->pickups);
     }
 
+    /**
+     * @param array<int, Pickup> $pickups
+     *
+     * @return array<int, Pickup>
+     */
     private function patchAndSortPickups(array $pickups): array
     {
         $this->enrichPickupDetails($pickups);