chore: fix phpstan errors

src/BusProNet/XmlParser/AbstractParser.php

@@ -39,6 +39,7 @@ abstract class AbstractParser
         return 0 < $node->count() && $this->stringToBool($node->text());
     }
 
+    /** @return list<string> */
     protected function getArrayValue(Crawler $node, string $separator = ','): array
     {
         if (0 === $node->count()) {