chore(deps-dev): bump mailparser from 0.6.1 to 3.6.9

Bumps [mailparser](https://github.com/nodemailer/mailparser) from 0.6.1 to 3.6.9.
- [Release notes](https://github.com/nodemailer/mailparser/releases)
- [Changelog](https://github.com/nodemailer/mailparser/blob/master/CHANGELOG.md)
- [Commits](nodemailer/mailparser@v0.6.1...v3.6.9)

---
updated-dependencies:
- dependency-name: mailparser
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/fxa-auth-server/package.json

@@ -199,7 +199,7 @@
     "load-grunt-tasks": "^5.1.0",
     "lodash.chunk": "4.2.0",
     "lodash.pick": "4.4.0",
-    "mailparser": "0.6.1",
+    "mailparser": "3.6.9",
     "mjml-browser": "^4.15.3",
     "mocha": "^10.0.0",
     "moment": "^2.30.1",