Bump eslint from 9.22.0 to 9.31.0 in /frontend

Bumps [eslint](https://github.com/eslint/eslint) from 9.22.0 to 9.31.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.22.0...v9.31.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-version: 9.31.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]