build(deps): bump nodemailer and @types/nodemailer in /backend (#630)

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) and [@types/nodemailer](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/nodemailer). These dependencies needed to be updated together.

Updates `nodemailer` from 7.0.12 to 7.0.13
- [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/v7.0.12...v7.0.13)

Updates `@types/nodemailer` from 7.0.5 to 7.0.9
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/nodemailer)

---
updated-dependencies:
- dependency-name: nodemailer
  dependency-version: 7.0.13
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: "@types/nodemailer"
  dependency-version: 7.0.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

backend/package.json

@@ -42,9 +42,9 @@
   "dependencies": {
     "@fastify/type-provider-typebox": "^5.2.0",
     "@types/jest": "^30.0.0",
-    "@types/nodemailer": "^7.0.5",
+    "@types/nodemailer": "^7.0.9",
     "fastify": "^5.7.2",
-    "nodemailer": "^7.0.12",
+    "nodemailer": "^7.0.13",
     "ts-dotenv": "^0.9.1"
   },
   "jest": {