Bump eslint from 8.57.0 to 9.26.0 in /frontend

Bumps [eslint](https://github.com/eslint/eslint) from 8.57.0 to 9.26.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/v9.26.0/CHANGELOG.md)
- [Commits](eslint/eslint@v8.57.0...v9.26.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-version: 9.26.0
  dependency-type: direct:development
...

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Author: dependabot[bot]