Bump nodemailer from 6.9.7 to 6.9.9 in /main (#390)

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.9.7 to 6.9.9.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v6.9.7...v6.9.9)

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

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main/package.json

@@ -49,7 +49,7 @@
     "mongoose": "^7.6.1",
     "node-cron": "^3.0.2",
     "node-fetch": "^2.3.0",
-    "nodemailer": "^6.7.0",
+    "nodemailer": "^6.9.9",
     "object-sizeof": "^1.2.0",
     "passport": "^0.3.2",
     "passport-google-oauth": "^1.0.0",