Bump moment from 2.22.2 to 2.29.4 in /client

Bumps [moment](https://github.com/moment/moment) from 2.22.2 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@2.22.2...2.29.4)

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

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

client/package.json

@@ -19,7 +19,7 @@
     "copy-to-clipboard": "3.2.0",
     "downshift": "^1.31.14",
     "fetch-mock": "6.0.0",
-    "moment": "2.22.2",
+    "moment": "2.29.4",
     "prop-types": "15.7.2",
     "query-string": "5",
     "react": "16.8.5",