build(deps): bump nodemailer from 4.6.8 to 6.6.1

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 4.6.8 to 6.6.1.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nodemailer/nodemailer/compare/v4.6.8...v6.6.1)

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

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

packages/backend/package.json

@@ -74,7 +74,7 @@
     "mongoose": "^5.12.13",
     "mongoose-bcrypt": "^1.8.1",
     "mongoose-encryption": "^2.1.0",
-    "nodemailer": "4.6.8",
+    "nodemailer": "6.6.1",
     "passport": "0.4.0",
     "passport-jwt": "4.0.0",
     "query-string": "6.2.0",