Update dependency html-proofer to v3.19.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
html-proofer	3.19.2 -> 3.19.4

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Release Notes

gjtorikian/html-proofer (html-proofer)

v3.19.4

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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

v3.19.3

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Fixed bugs:

• mailto without email shouldn't fail #​552

Closed issues:

• links without html suffix claimed to be broken #​654
• Unexpected 404 link #​648
• Thread 0 Crashes on M1 chip (MacOS Big Sur 13.1) #​646
• Add GitHub Action wrappers to README? #​642
• Add support for site.baseurl, workaround #​618
• Some URLs are reported invalid but are in fact OK #​581
• Internally linking to <valid URL> which does not exist #​542

Merged pull requests:

• Add typhoeus-config user agent and cookies snippets to the README #​666 (JackWilb)
• Run htmlproofer and precede it with the correct ruby binary #​665 (dleidert)
• Document how to adjust for a baseurl #​658 (PeterJCLaw)
• Add flag to allow no-email mailto links #​657 (PeterJCLaw)
• fix redirect (after changing name of master branch) #​653 (matkoniecz)
• Add example using proof-html GitHub action #​651 (anishathalye)
• Replace Nokogumbo with Nokogiri #​650 (stevecheckoway)
• Apply Uniq filter to remove duplicate issues #​649 (uberfuzzy)

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