chore: fix phpstan errors

src/BusProNet/Model/BaseData.php

@@ -12,6 +12,7 @@ namespace App\BusProNet\Model;
  */
 class BaseData
 {
+    /** @param array<array-key, mixed> $items */
     public function __construct(private readonly array $items)
     {
     }
@@ -19,7 +20,7 @@ class BaseData
     /**
      * Retrieves all items in the base data collection.
      *
-     * @return array The complete items array
+     * @return array<array-key, mixed> The complete items array
      */
     public function getItems(): array
     {