Bump eslint in /src/backend in the dependencies group across 1 directory

Bumps the dependencies group with 1 update in the /src/backend directory: [eslint](https://github.com/eslint/eslint).


Updates `eslint` from 9.2.0 to 9.14.0
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.2.0...v9.14.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>