Bump mongoose from 7.0.5 to 7.1.0 in /backend

Bumps [mongoose](https://github.com/Automattic/mongoose) from 7.0.5 to 7.1.0.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/CHANGELOG.md)
- [Commits](Automattic/mongoose@7.0.5...7.1.0)

---
updated-dependencies:
- dependency-name: mongoose
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/package-lock.json

@@ -28,7 +28,7 @@
     "dotenv": "^16.0.3",
     "express": "^4.18.2",
     "jsonwebtoken": "^9.0.0",
-    "mongoose": "^7.0.5",
+    "mongoose": "^7.1.0",
     "morgan": "^1.10.0"
   },
   "devDependencies": {