build(deps-dev): bump eslint from 9.19.0 to 9.21.0 (#515)

Bumps [eslint](https://github.com/eslint/eslint) from 9.19.0 to 9.21.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.19.0...v9.21.0)

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

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Author: dependabot[bot]