build(deps-dev): bump jest from 30.2.0 to 30.3.0 in /backend (#675)

Bumps [jest](https://github.com/jestjs/jest/tree/HEAD/packages/jest) from 30.2.0 to 30.3.0.
- [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/v30.3.0/packages/jest)

---
updated-dependencies:
- dependency-name: jest
  dependency-version: 30.3.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

backend/package.json

@@ -22,7 +22,7 @@
     "@jest/globals": "^30.3.0",
     "eslint": "^10.0.3",
     "eslint-config-it4c": "^0.12.0",
-    "jest": "^30.2.0",
+    "jest": "^30.3.0",
     "ts-jest": "^29.4.6",
     "tsup": "^8.5.1",
     "tsx": "^4.21.0",