Update html-proofer requirement from 3.19.4 to 4.0.1

[dependabot[bot]]

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

Changelog

Sourced from html-proofer's changelog.

v4.0.1 (2022-07-12)

Full Changelog

Closed issues:

• Linking to directories without a trailing slash in 4.0.0 #718

Merged pull requests:

• Restore follow_location #719 (gjtorikian)

v4.0.0 (2022-07-11)

Full Changelog

Closed issues:

• From time to time I get response code 0 with Stream error in the HTTP/2 framing layer #716
• Hash not exist in path with implicit index #714
• Config section of README seems to be out of sync with actual CLI options #713
• Allow separate internal/external cache timeframe #708
• Update nokogiri dependency #705
• Issue with internal links re-checking logic / cache keys #702
• Empty alt tag #228

Merged pull requests:

• Allow for empty alt attributes #717 (gjtorikian)
• Address internal hash issue #715 (gjtorikian)
• Fix internal link issue #712 (gjtorikian)
• Use <path>:<line> in the CLI reporter #711 (riccardoporreca)
• Split timeframes out #710 (gjtorikian)
• Bump actions/checkout from 2 to 3 #709 (dependabot[bot])
• chore: Included githubactions in the dependabot config #707 (naveensrinivasan)
• chore: Set permissions for GitHub actions #706 (naveensrinivasan)
• Fix internal link format #699 (gjtorikian)
• Fix internal cache metadata check #696 (riccardoporreca)
• Feature/fix files sources processing #694 (riccardoporreca)
• :gem: 4.0.0 #674 (gjtorikian)

v3.19.4 (2022-05-19)

Full Changelog

Closed issues:

• Add JUnit-compatible Reporter #703
• Problems with internal link cache re-checking logic (4.0.0.rc3) #695
• File / sources processing issues #693

... (truncated)

Commits

• 91b13fd :gem: 4.0.1
• 7279f37 Merge pull request #719 from gjtorikian/ugh-follow-locations-please
• 73d3a86 Restore follow_location
• 201b673 Release :gem: v4
• 38e344b Merge pull request #674 from gjtorikian/version-4
• 7b227f9 Merge branch 'main' into version-4
• fabf7c0 Merge pull request #717 from gjtorikian/alt-in
• 35d5627 update
• a5b0a3b typo
• 3f31444 simplify
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #1773.