build(deps-dev): bump html-validate from 6.6.1 to 6.7.1 (#474)

Bumps [html-validate](https://gitlab.com/html-validate/html-validate) from 6.6.1 to 6.7.1.
- [Release notes](https://gitlab.com/html-validate/html-validate/tags)
- [Changelog](https://gitlab.com/html-validate/html-validate/blob/master/CHANGELOG.md)
- [Commits](https://gitlab.com/html-validate/html-validate/compare/v6.6.1...v6.7.1)

---
updated-dependencies:
- dependency-name: html-validate
  dependency-type: direct:development
  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: Maximilian Franzke <[email protected]>

Author: dependabot[bot]