Bump stylelint-scss from 6.2.1 to 6.4.1 (#340)

Bumps [stylelint-scss](https://github.com/stylelint-scss/stylelint-scss) from 6.2.1 to 6.4.1.
- [Release notes](https://github.com/stylelint-scss/stylelint-scss/releases)
- [Changelog](https://github.com/stylelint-scss/stylelint-scss/blob/master/CHANGELOG.md)
- [Commits](stylelint-scss/stylelint-scss@v6.2.1...v6.4.1)

---
updated-dependencies:
- dependency-name: stylelint-scss
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Brett Jankord <[email protected]>