build(deps-dev): bump html-validate from 5.0.2 to 5.1.1 (#216)

Bumps [html-validate](https://gitlab.com/html-validate/html-validate) from 5.0.2 to 5.1.1.
- [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/v5.0.2...v5.1.1)

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

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Author: dependabot[bot]