fix: unblock PR 502 checks

* build(deps-dev): bump typescript from 5.9.3 to 6.0.2 in /backend

Bumps [typescript](https://github.com/microsoft/TypeScript) from 5.9.3 to 6.0.2.
- [Release notes](https://github.com/microsoft/TypeScript/releases)
- [Commits](https://github.com/microsoft/TypeScript/compare/v5.9.3...v6.0.2)

---
updated-dependencies:
- dependency-name: typescript
  dependency-version: 6.0.2
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

* fix: unblock PR 502 checks

---------

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

backend/package.json

@@ -47,7 +47,7 @@
     "pino-pretty": "^13.1.3",
     "supertest": "^7.2.2",
     "tsx": "^4.19.0",
-    "typescript": "^5.5.4",
+    "typescript": "^6.0.2",
     "vitest": "^4.0.16"
   }
 }