Bump nodemailer from 4.0.1 to 6.9.9

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 4.0.1 to 6.9.9.
- [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/v4.0.1...v6.9.9)

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

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

package-lock.json

@@ -15486,9 +15486,9 @@
       }
     },
     "nodemailer": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmmirror.com/nodemailer/-/nodemailer-4.0.1.tgz",
-      "integrity": "sha512-CVY7O+5/AEJ9NCWDUWAp1MlQMT/8xRtZmK+H/7O0G70+6oKkfc7pt8mWN3+Ju/9lS/9itL27gUmD5J45rvxktw=="
+      "version": "6.9.9",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.9.9.tgz",
+      "integrity": "sha512-dexTll8zqQoVJEZPwQAKzxxtFn0qTnjdQTchoU6Re9BUUGBJiOy3YMn/0ShTW6J5M0dfQ1NeDeRTTl4oIWgQMA=="
     },
     "nodemon": {
       "version": "1.19.4",