chore(deps-dev): bump prettier from 3.9.5 to 3.9.6

Bumps [prettier](https://github.com/prettier/prettier) from 3.9.5 to 3.9.6.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](prettier/prettier@3.9.5...3.9.6)

---
updated-dependencies:
- dependency-name: prettier
  dependency-version: 3.9.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

backend/package.json

@@ -83,7 +83,7 @@
     "eslint-config-prettier": "^9.0.0",
     "eslint-plugin-prettier": "^5.0.0",
     "jest": "^29.5.0",
-    "prettier": "^3.0.0",
+    "prettier": "^3.9.6",
     "source-map-support": "^0.5.21",
     "supertest": "^7.0.0",
     "ts-jest": "^29.1.0",