Change enyo/dropzone version spec to ^5

composer.json

@@ -192,7 +192,7 @@
         "drupal/webform_views": "5.0-alpha2",
         "drush-ops/behat-drush-endpoint": "0.0.5",
         "drush/drush": "9.7.2",
-        "enyo/dropzone": "5.7.6",
+        "enyo/dropzone": "^5",
         "gdsmith/jquery.easing": "1.4.1",
         "oomphinc/composer-installers-extender": "2.0",
         "pantheon-systems/quicksilver-pushback": "1.0.1"