chore(deps-dev): bump eslint-plugin-prettier in /backend

Bumps [eslint-plugin-prettier](https://github.com/prettier/eslint-plugin-prettier) from 5.2.1 to 5.2.2.
- [Release notes](https://github.com/prettier/eslint-plugin-prettier/releases)
- [Changelog](https://github.com/prettier/eslint-plugin-prettier/blob/master/CHANGELOG.md)
- [Commits](prettier/eslint-plugin-prettier@v5.2.1...v5.2.2)

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

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