build(deps): bump jest and @types/jest in /backend (#428)

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

Updates `jest` from 29.7.0 to 30.0.5
- [Release notes](https://github.com/jestjs/jest/releases)
- [Changelog](https://github.com/jestjs/jest/blob/main/CHANGELOG.md)
- [Commits](https://github.com/jestjs/jest/commits/v30.0.5/packages/jest)

Updates `@types/jest` from 29.5.14 to 30.0.0
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/jest)

---
updated-dependencies:
- dependency-name: jest
  dependency-version: 30.0.5
  dependency-type: direct:development
  update-type: version-update:semver-major
- dependency-name: "@types/jest"
  dependency-version: 30.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

backend/package.json

@@ -37,14 +37,14 @@
     "eslint-plugin-react-refresh": "^0.4.20",
     "eslint-plugin-security": "^3.0.1",
     "eslint-plugin-yml": "^1.18.0",
-    "jest": "^29.7.0",
+    "jest": "^30.0.5",
     "ts-jest": "^29.4.0",
     "tsx": "^4.20.3",
     "typescript": "^5.8.3"
   },
   "dependencies": {
     "@fastify/type-provider-typebox": "^5.2.0",
-    "@types/jest": "^29.5.14",
+    "@types/jest": "^30.0.0",
     "@types/nodemailer": "^6.4.17",
     "fastify": "^5.4.0",
     "nodemailer": "^7.0.5",