fix: upgrade mongoose from 8.6.3 to 8.18.2

Snyk has created this PR to upgrade mongoose from 8.6.3 to 8.18.2.

See this package in npm:
mongoose

See this project in Snyk:
https://app.snyk.io/org/nerds-github/project/3dcf60af-a114-4d8f-a2c2-6553d37c8709?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

security/package.json

@@ -2,7 +2,7 @@
   "dependencies": {
     "@getbrevo/brevo": "^2.2.0",
     "dayjs": "^1.11.13",
-    "mongoose": "^8.3.2"
+    "mongoose": "^8.18.2"
   },
   "devDependencies": {
     "@types/node": "^20.12.13",