chore(deps)(deps): bump nodemailer from 8.0.5 to 9.0.0

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 8.0.5 to 9.0.0.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v8.0.5...v9.0.0)

---
updated-dependencies:
- dependency-name: nodemailer
  dependency-version: 9.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/package.json

@@ -63,7 +63,7 @@
     "handlebars": "^4.7.8",
     "helmet": "^8.1.0",
     "ioredis": "^5.8.2",
-    "nodemailer": "^8.0.5",
+    "nodemailer": "^9.0.0",
     "openai": "^6.39.0",
     "passport": "^0.7.0",
     "passport-jwt": "^4.0.1",