fix phpstan errors

src/Service/ServiceIterator/StorageIterator.php

@@ -22,6 +22,9 @@ class StorageIterator
     ) {
     }
 
+    /**
+     * @return iterable<FileStorageInterface>
+     */
     public function getStorages(): iterable
     {
         return $this->storageServices;

src/Service/Typo3/Typo3Service.php

@@ -22,6 +22,7 @@ class Typo3Service
      * Send a command to the given route of the Typo3 API.
      *
      * @param array<mixed> $parameters
+     * @param array<mixed> $headers
      *
      * @throws TransportExceptionInterface
      */