chore(deps): bump nodemailer from 6.8.0 to 6.9.11

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.8.0 to 6.9.11.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v6.8.0...v6.9.11)

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

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

package.json

@@ -52,7 +52,7 @@
     "mongodb": "^4.10.0",
     "mongoose": "^6.3.1",
     "morgan": "^1.10.0",
-    "nodemailer": "^6.8.0",
+    "nodemailer": "^6.9.11",
     "serve-favicon": "^2.5.0",
     "showdown": "^2.1.0",
     "uuid": "^9.0.0"