Bump html-proofer from 3.19.2 to 3.19.3

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.19.2 to 3.19.3.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Changelog](https://github.com/gjtorikian/html-proofer/blob/main/CHANGELOG.md)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.19.2...v3.19.3)