chore(deps): bump eslint and eslint-config-next in /frontend

Bumps [eslint](https://github.com/eslint/eslint) and [eslint-config-next](https://github.com/vercel/next.js/tree/HEAD/packages/eslint-config-next). These dependencies needed to be updated together.

Updates `eslint` from 8.42.0 to 9.39.2
- [Release notes](https://github.com/eslint/eslint/releases)
- [Commits](eslint/eslint@v8.42.0...v9.39.2)

Updates `eslint-config-next` from 13.4.4 to 16.1.6
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v16.1.6/packages/eslint-config-next)

---
updated-dependencies:
- dependency-name: eslint
  dependency-version: 9.39.2
  dependency-type: direct:production
- dependency-name: eslint-config-next
  dependency-version: 16.1.6
  dependency-type: direct:production
...

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

Author: dependabot[bot]