chore(backend): bump typescript from 5.9.3 to 6.0.2 in /services/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](microsoft/TypeScript@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>

Author: dependabot[bot]

services/backend/package.json

@@ -79,7 +79,7 @@
     "ts-jest": "^29.4.6",
     "ts-loader": "^9.5.4",
     "ts-node": "^10.9.2",
-    "typescript": "^5.9.2",
+    "typescript": "^6.0.3",
     "typescript-eslint": "^8.56.1",
     "vitest": "^3.2.4",
     "webpack": "^5.105.4",