mgr/dashboard: bump stylelint-config-sass-guidelines

Bumps [stylelint-config-sass-guidelines](https://github.com/bjankord/stylelint-config-sass-guidelines) from 7.1.0 to 12.1.0.
- [Release notes](https://github.com/bjankord/stylelint-config-sass-guidelines/releases)
- [Changelog](https://github.com/bjankord/stylelint-config-sass-guidelines/blob/main/CHANGELOG.md)
- [Commits](bjankord/stylelint-config-sass-guidelines@v7.1.0...v12.1.0)

---
updated-dependencies:
- dependency-name: stylelint-config-sass-guidelines
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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