chore(deps-dev): bump eslint in /wp-content/themes/terraso

Bumps [eslint](https://github.com/eslint/eslint) from 9.17.0 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@v9.17.0...v9.21.0)

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

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