Update html-pipeline requirement from ~> 2.2 to >= 2.2, < 4.0

[dependabot[bot]]

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

Changelog

Sourced from html-pipeline's changelog.

v2.14.3 (2022-10-14)

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Closed issues:

• Allow vertical-align #366
• Since bump 2.14.2 builds are failing #363

Merged pull requests:

• Replace EscapeUtils.escape_html with CGI.escape_html #365 (ramhoj)

v2.14.2 (2022-06-12)

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Merged pull requests:

• handle invalid data urls in absolute source filter #361 (glaszig)

v2.14.1 (2022-03-31)

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Closed issues:

• 2.14.0 is disconnected #358
• I would love to use the vscode codicon.ttf in my readme.md #356
• Html-pipeline #355
• Canalizacion de HTML #354
• Change branch name off of master #340
• New feature request: team mention filter #311
• code in header produce invalid anchor #308
• Stop "camo"ing "github.io" #305
• A filter to produce diffs with syntax highlighting in html, maybe. #270
• Require pygments.rb or remove Pygments references #235
• Allow ᴀʀɪᴀ attributes for blind people. #219
• 'lexer' is removed from github-linguist #217
• Please document how to use the html-pipeline binary without command‐line arguments! #213
• PHP syntax highlight #212

v2.13.2 (2020-12-04)

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Merged pull requests:

• Fix custom renderer with unsafe option missing pre lang #341 (kazk)

... (truncated)

Commits

• 84c75b3 :gem: bump to 2.14.3
• 03ae30d Merge pull request #365 from ramhoj/use-cgi-escape-html
• 807c23c Replace EscapeUtils.escape_html with CGI.escape_html
• 32a21be :gem: bump to 2.14.2
• 578f958 Merge pull request #361 from glaszig/data-url
• 3cbad68 handle invalid data urls in absolute source filter
• 4f1aab0 Properly release v2.14.x
• 0e3d84e :gem: bump to 2.13.2
• f378099 Merge pull request #341 from kazk/fix-unsafe-custom-renderer-missing-pre-lang
• b717f31 Fix custom renderer with unsafe option missing pre lang
• Additional commits viewable in compare view

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[parkr]

These two versions require in two different ways, so a try...LoadError will need to be added.

[parkr]

I took a swing at this. It's much more complicated than changing the require statement:

1. EmojiFilter has become a NodeFilter, and HTMLPipeline.new has changed its initialization procedure.
2. The tests use just EmojiFilter.call but the README indicates that I should be initializing the EmojiFilter when adding it to the list of node_filters, so EmojiFilter.new.call.

I don't have enough time to fix this now, but given the huge differences, I'd recommend not trying to support the old and the new like this PR suggests. Just upgrade to 3.0 and call it done.