Bump html-proofer from 3.17.2 to 3.17.3

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.17.2 to 3.17.3.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.17.2...v3.17.3)
8 jobs for dependabot/bundler/html-proofer-3.17.3 in 3 minutes and 11 seconds (queued for 4 seconds)