chore(deps): bump nodemailer from 7.0.11 to 8.0.4 in /backend

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 7.0.11 to 8.0.4.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v7.0.11...v8.0.4)

---
updated-dependencies:
- dependency-name: nodemailer
  dependency-version: 8.0.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

backend/package.json

@@ -44,7 +44,7 @@
     "morgan": "^1.10.0",
     "node-cron": "^2.0.3",
     "node-fetch": "^2.6.7",
-    "nodemailer": "^7.0.11"
+    "nodemailer": "^8.0.4"
   },
   "directories": {
     "test": "test"