Bump moment from 2.20.1 to 2.29.4 in /app

Bumps [moment](https://github.com/moment/moment) from 2.20.1 to 2.29.4.
- [Release notes](https://github.com/moment/moment/releases)
- [Changelog](https://github.com/moment/moment/blob/develop/CHANGELOG.md)
- [Commits](moment/moment@2.20.1...2.29.4)

---
updated-dependencies:
- dependency-name: moment
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

app/package-lock.json

@@ -52,7 +52,7 @@
     "less": "~3.8.1",
     "lodash": "^4.13.1",
     "md5": "^2.2.1",
-    "moment": "^2.13.0",
+    "moment": "^2.29.4",
     "nugget": "^2.0.0",
     "q": "^1.4.1",
     "rimraf": "^2.5.4",