build(deps-dev): update html-proofer requirement from ~> 3.18 to ~> 4.4

[dependabot]

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

Changelog

Sourced from html-proofer's changelog.

v4.4.3 (2022-10-08)

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Merged pull requests:

• Revert "Validate options" #774 (gjtorikian)

v4.4.2 (2022-10-07)

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Closed issues:

• erstiebegrüßung.html causing problems on macOS #771
• HTMLProofer times out #768

Merged pull requests:

• Create erstiebegrüßung.html from code #772 (asbjornu)
• Validate options #767 (asbjornu)

v4.4.1 (2022-09-25)

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Closed issues:

• Custom Checker class is not executed #764
• --cache unvailable in CLI #763
• --parallel unavailable in CLI #762
• HTMLproofer does not properly ignore links #756
• Mailto check failed in some cases #754

Merged pull requests:

• Optimize checking internal link hashes in target files #770 (riccardoporreca)
• Fix --swap-attributes CLI argument in README #765 (mark-monteiro)
• Fix and improve swap_attribute README example #755 (riccardoporreca)

v4.4.0 (2022-08-13)

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Closed issues:

• --assume_extension unexpected behaviour #751
• Protocol-relative (no http(s):) URL issue: Script cache issue and anti-pattern consideration #750
• Questions on command-line options in 4.x #749

... (truncated)

Commits

• 6f8a324 💎 4.4.3
• df573ea Merge pull request #774 from gjtorikian/revert-767-feature/validate_options
• 2abcf02 Revert "Validate options"
• c752f80 💎 4.4.2
• 942c2f1 Merge pull request #767 from asbjornu/feature/validate_options
• 12a9409 Validate options
• c0e2bde Merge pull request #772 from asbjornu/feature/create_unicode_file_from_code
• dd31338 Create erstiebegrüßung.html from code
• 2e7ed80 4.4.1
• fc5eab8 Merge pull request #770 from riccardoporreca/feature/768-optimize-internal-ha...
• Additional commits viewable in compare view

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