build(deps): bump nodemailer from 6.7.8 to 6.9.9

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.7.8 to 6.9.9.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v6.7.8...v6.9.9)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -77,7 +77,7 @@
     "mongoose-unique-validator": "3.1.0",
     "morgan": "1.9",
     "multipipe": "2.0",
-    "nodemailer": "6.7.8",
+    "nodemailer": "6.9.9",
     "passport": "0.6.0",
     "passport-local": "1.0.0",
     "path": "0.12",