Bump nodemailer from 6.4.2 to 6.4.16

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.4.2 to 6.4.16.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v6.4.2...v6.4.16)

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

Author: dependabot[bot]

package-lock.json

@@ -67,7 +67,7 @@
     "multer": "^1.4.2",
     "needle": "^2.4.0",
     "node-polyglot": "^2.4.0",
-    "nodemailer": "^6.3.0",
+    "nodemailer": "^6.4.16",
     "optimist": "^0.6.1",
     "passport": "^0.4.0",
     "request": "^2.88.0",