chore(deps): bump mongodb and mongoose in /backend

Bumps [mongodb](https://github.com/mongodb/node-mongodb-native) to 4.17.1 and updates ancestor dependency [mongoose](https://github.com/Automattic/mongoose). These dependencies need to be updated together.


Updates `mongodb` from 4.9.1 to 4.17.1
- [Release notes](https://github.com/mongodb/node-mongodb-native/releases)
- [Changelog](https://github.com/mongodb/node-mongodb-native/blob/v4.17.1/HISTORY.md)
- [Commits](https://github.com/mongodb/node-mongodb-native/compare/v4.9.1...v4.17.1)

Updates `mongoose` from 6.6.5 to 6.12.0
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Automattic/mongoose/compare/6.6.5...6.12.0)

---
updated-dependencies:
- dependency-name: mongodb
  dependency-type: indirect
- dependency-name: mongoose
  dependency-type: direct:production
...

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

backend/package.json

@@ -26,7 +26,7 @@
     "cors": "^2.8.5",
     "express": "^4.18.2",
     "moment": "^2.29.4",
-    "mongoose": "^6.6.5",
+    "mongoose": "^6.12.0",
     "nodemailer": "^6.9.1",
     "oauth": "^0.10.0",
     "redis": "^4.6.5",