Bump moment from 2.27.0 to 2.28.0

Bumps [moment](https://github.com/moment/moment) from 2.27.0 to 2.28.0.
- [Release notes](https://github.com/moment/moment/releases)
- [Changelog](https://github.com/moment/moment/blob/develop/CHANGELOG.md)
- [Commits](moment/moment@2.27.0...2.28.0)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -34,7 +34,7 @@
     "elm-pep": "1.0.6",
     "file-saver": "2.0.2",
     "lodash.debounce": "4.0.8",
-    "moment": "2.27.0",
+    "moment": "2.28.0",
     "ol": "6.4.3",
     "proj4": "2.6.2",
     "vue": "2.6.12",