build(deps-dev): bump html-proofer from 3.17.3 to 3.17.4 in /docs

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.17.3 to 3.17.4.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.17.3...v3.17.4

)

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