fix: upgrade mongoose from 8.16.0 to 8.16.2

Snyk has created this PR to upgrade mongoose from 8.16.0 to 8.16.2.

See this package in npm:
mongoose

See this project in Snyk:
https://app.snyk.io/org/nodeshift-agg/project/0865fbfa-c5be-44cc-ab70-e2f03f8f4eb1?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

backend/package-lock.json

@@ -17,7 +17,7 @@
     "cors": "^2.8.4",
     "express": "^5.1.0",
     "log4js": "^6.7.0",
-    "mongoose": "^8.16.0"
+    "mongoose": "^8.16.2"
   },
   "devDependencies": {
     "chai": "^4.4.1",