Bump sortablejs from 1.13.0 to 1.14.0

Bumps [sortablejs](https://github.com/SortableJS/Sortable) from 1.13.0 to 1.14.0.
- [Release notes](https://github.com/SortableJS/Sortable/releases)
- [Commits](https://github.com/SortableJS/Sortable/compare/1.13.0...1.14.0)

---
updated-dependencies:
- dependency-name: sortablejs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -15,7 +15,7 @@
     "jstree": "^3.3.11",
     "opensans-webkit": "^1.1.0",
     "popper.js": "^1.16.1",
-    "sortablejs": "^1.13.0",
+    "sortablejs": "^1.14.0",
     "underscore": "^1.13.1",
     "vis": "^4.21.0",
     "webpack-merge": "^5.8.0"