Bump moment from 2.27.0 to 2.29.4 in /frontend

Bumps [moment](https://github.com/moment/moment) from 2.27.0 to 2.29.4.
- [Release notes](https://github.com/moment/moment/releases)
- [Changelog](https://github.com/moment/moment/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/moment/moment/compare/2.27.0...2.29.4)

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

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

frontend/package.json

@@ -26,7 +26,7 @@
     "messageformat": "^2.3.0",
     "messageformat-loader": "^0.8.1",
     "mini-css-extract-plugin": "^0.9.0",
-    "moment": "^2.24.0",
+    "moment": "^2.29.4",
     "node-sass": "^6.0.1",
     "nodemon": "^2.0.2",
     "numeral": "^2.0.6",