Fix bug in lock files

Author: jaapmarcus

install/deb/filemanager/filegator/composer.json

@@ -18,7 +18,8 @@
         "php-di/php-di": "^6.0",
         "rakit/validation": "^1.1",
         "league/flysystem": "^1.1",
-        "league/flysystem-ziparchive": "^1.0"
+        "league/flysystem-ziparchive": "^1.0",
+        "league/flysystem-sftp": "^1.0"
     },
     "authors": [
         {