Bump eslint from 9.38.0 to 9.39.0 in /packages/frontend

Bumps [eslint](https://github.com/eslint/eslint) from 9.38.0 to 9.39.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Commits](eslint/eslint@v9.38.0...v9.39.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-version: 9.39.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]