Bump moment from 2.24.0 to 2.29.4 in /frontend

Bumps [moment](https://github.com/moment/moment) from 2.24.0 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@2.24.0...2.29.4)

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

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

Author: dependabot[bot]

frontend/package.json

@@ -16,7 +16,7 @@
     "less": "^3.11.1",
     "less-loader": "^5.0.0",
     "linkifyjs": "^2.1.9",
-    "moment": "^2.24.0",
+    "moment": "^2.29.4",
     "moment-duration-format": "^2.3.2",
     "node-sass": "^4.13.1",
     "react": "^16.13.1",

frontend/yarn.lock

@@ -7275,10 +7275,10 @@ moment-duration-format@^2.3.2:
   resolved "https://registry.yarnpkg.com/moment-duration-format/-/moment-duration-format-2.3.2.tgz#5fa2b19b941b8d277122ff3f87a12895ec0d6212"
   integrity sha512-cBMXjSW+fjOb4tyaVHuaVE/A5TqkukDWiOfxxAjY+PEqmmBQlLwn+8OzwPiG3brouXKY5Un4pBjAeB6UToXHaQ==
 
-moment@^2.24.0:
-  version "2.24.0"
-  resolved "https://registry.yarnpkg.com/moment/-/moment-2.24.0.tgz#0d055d53f5052aa653c9f6eb68bb5d12bf5c2b5b"
-  integrity sha512-bV7f+6l2QigeBBZSM/6yTNq4P2fNpSWj/0e7jQcy87A8e7o2nAfP/34/2ky5Vw4B9S446EtIhodAzkFCcR4dQg==
+moment@^2.24.0, moment@^2.29.4:
+  version "2.29.4"
+  resolved "https://registry.yarnpkg.com/moment/-/moment-2.29.4.tgz#3dbe052889fe7c1b2ed966fcb3a77328964ef108"
+  integrity sha512-5LC9SOxjSc2HF6vO2CyuTDNivEdoz2IvyJJGj6X8DJ0eFyfszE0QiEd+iXmBvUP3WHxSjFH/vIsA0EN00cgr8w==
 
 move-concurrently@^1.0.1:
   version "1.0.1"