Update html-proofer requirement from ~> 4.2 to ~> 5.0
Update html-proofer requirement from ~> 4.2 to ~> 5.0

Updates the requirements on [html-proofer](https://github.com/gjtorikian/html-proofer) to permit the latest version.
- [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/v4.2.0...v5.0.0)

---
updated-dependencies:
- dependency-name: html-proofer
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
jonasbn/til,jonasbn/til,jonasbn/til,jonasbn/til,jonasbn/til,jonasbn/til