chore: fix phpstan errors

src/BusProNet/XmlParser/DocumentsParser.php

@@ -58,6 +58,7 @@ class DocumentsParser
         return base64_decode($pdfData);
     }
 
+    /** @return array{string, string} */
     private function getFileInfo(Crawler $node): array
     {
         $pdfData = $this->decode($node->filterXPath('.//pdf'));