chore(deps): bump smtp-server from 3.19.21 to 3.19.23 (#4276)

Bumps [smtp-server](https://github.com/nodemailer/smtp-server) from 3.19.21 to 3.19.23.
- [Release notes](https://github.com/nodemailer/smtp-server/releases)
- [Changelog](https://github.com/nodemailer/smtp-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nodemailer/smtp-server/compare/v3.19.21...v3.19.23)

---
updated-dependencies:
- dependency-name: smtp-server
  dependency-version: 3.19.23
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/backend/package.json

@@ -60,7 +60,7 @@
     "postal-mime": "^3.0.1",
     "replicate": "^1.0.0",
     "sharp": "^0.35.5",
-    "smtp-server": "^3.19.21",
+    "smtp-server": "^3.19.23",
     "socket.io": "^4.8.4",
     "svg-captcha": "^1.4.0",
     "together-ai": "^0.33.0",