Bump moment from 2.21.0 to 2.29.4 in /web_src

Bumps [moment](https://github.com/moment/moment) from 2.21.0 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/2.21.0...2.29.4)

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

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

web_src/package-lock.json

@@ -16195,9 +16195,9 @@
       }
     },
     "moment": {
-      "version": "2.21.0",
-      "resolved": "https://registry.npmjs.org/moment/-/moment-2.21.0.tgz",
-      "integrity": "sha512-TCZ36BjURTeFTM/CwRcViQlfkMvL1/vFISuNLO5GkcVm1+QHfbSiNqZuWeMFjj1/3+uAjXswgRk30j1kkLYJBQ==",
+      "version": "2.29.4",
+      "resolved": "https://registry.npmjs.org/moment/-/moment-2.29.4.tgz",
+      "integrity": "sha512-5LC9SOxjSc2HF6vO2CyuTDNivEdoz2IvyJJGj6X8DJ0eFyfszE0QiEd+iXmBvUP3WHxSjFH/vIsA0EN00cgr8w==",
       "dev": true
     },
     "morris.js": {

web_src/package.json

@@ -38,7 +38,7 @@
     "less": "3.0.1",
     "less-loader": "4.1.0",
     "lodash": "4.17.10",
-    "moment": "2.21.0",
+    "moment": "2.29.4",
     "node-sass": "^4.11.0",
     "optimize-css-assets-webpack-plugin": "3.2.0",
     "pretty-bytes": "4.0.2",