Bump nodemailer from 6.4.2 to 6.6.1

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.4.2 to 6.6.1.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v6.4.2...v6.6.1)

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

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

Author: dependabot[bot]

package-lock.json

@@ -38,7 +38,7 @@
     "jest": "^26.1.0",
     "jsonwebtoken": "^8.5.1",
     "morgan": "^1.10.0",
-    "nodemailer": "^6.4.2",
+    "nodemailer": "^6.6.1",
     "pg": "^7.17.1",
     "pg-hstore": "^2.3.3",
     "sequelize": "^5.21.3",