Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.11.1 to 3.12.0.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.11.1...v3.12.0

)

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