Bump eslint from 9.39.2 to 10.2.1 in /server/frontend

Bumps [eslint](https://github.com/eslint/eslint) from 9.39.2 to 10.2.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Commits](eslint/eslint@v9.39.2...v10.2.1)

---
updated-dependencies:
- dependency-name: eslint
  dependency-version: 10.2.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Author: dependabot[bot]