Update html-proofer requirement from 5.0.5 to 5.0.6

[dependabot[bot]]

Updates the requirements on html-proofer to permit the latest version.

Release notes

Sourced from html-proofer's releases.

v5.0.6

What's Changed

• Refactor/simplify internal link check resolution by @​riccardoporreca in gjtorikian/html-proofer#795

Full Changelog: https://github.com/gjtorikian/html-proofer/compare/v5.0.5...v5.0.6

Changelog

Sourced from html-proofer's changelog.

v5.0.6 (2023-03-15)

Full Changelog

Merged pull requests:

• Refactor/simplify internal link check resolution #795 (riccardoporreca)

v5.0.5 (2023-03-07)

Full Changelog

Closed issues:

• Reporting broken links when using relative internal links reported as broken #792
• v5 upgrade guide? #791
• Anchor links are encoded in html-proofer output #757

Merged pull requests:

• Fix cleaning relative links cache key #793 (riccardoporreca)
• remove proprietary pdf #790 (gjtorikian)

v5.0.4 (2023-01-20)

Full Changelog

Closed issues:

• Official HTMLProofer Docker image #788
• Crashing when checking the external hashes of URLs #787
• Test suite depends on vcr, which is not free software #786
• data-proofer-ignore does not silence "Input contains noncharacter" #785

Merged pull requests:

• Improved PDF hash handling #789 (gjtorikian)

v5.0.3 (2022-12-05)

Full Changelog

Closed issues:

• Buggy parsing of srcset attribute #783
• Changelog of a different project #782
• NoMethodError: undefined method `empty?' for true:TrueClass #781
• Set enforce_https to false on the CLI #727

Merged pull requests:

... (truncated)

Commits

• 8fd0ddc Merge pull request #795 from riccardoporreca/feature/internal-link-check-refa...
• 27bf3ee :gem: bump to 5.0.6
• 3d6df6e Read-only current_filename/_source attributes in Runner
• aba17cc Fix inline comments for full internal path construction
• 6913d4e Rename handling of internal full path construction
• d52d828 Refactor internal link paths resolution / existence check
• e0e0170 Simplify relative link logic, removing unnecessary code
• b4c76f7 Lint Ruby code chunks in README.md
• 4f5d227 Align "Custom tests" example to the current functionality / code style
• 41af0a1 Extend Check.add_failure to allow an Element argument
• Additional commits viewable in compare view

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