Bump moment from 2.29.2 to 2.29.4 in /functions

Bumps [moment](https://github.com/moment/moment) from 2.29.2 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@2.29.2...2.29.4)

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

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

Author: dependabot[bot]

functions/package-lock.json

@@ -19,7 +19,7 @@
     "firebase-functions": "^3.20.1",
     "mailgun-js": "^0.22.0",
     "marked": "^0.7.0",
-    "moment": "^2.29.2",
+    "moment": "^2.29.4",
     "mustache": "^2.3.0",
     "node-fetch": "^3.1.1"
   },