Bump markdown from 3.9 to 3.11.1

[dependabot]

Bumps markdown from 3.9 to 3.11.1.

Release notes

Sourced from markdown's releases.

Release 3.11.1

Fixed

• Update serializer to be non-recursive (#1644).
• Improve ancestor handling in the inline Treeprocessor (#1646).
• Keep a raw HTML comment inside an inline HTML element that closes in the same paragraph, instead of splitting the paragraph around it (#1643).
• Fix issue where inline HTML attributes were rejected if they had < or > in the attribute (#1647).
• Fix issue where an unterminated end tag (</foo) could cause all remaining content to be dropped (#1651).
• Complete rework of emphasis handling to improve nested emphasis handling better (#1632).

Release 3.11.0

Changed

• Inline processors now resume searching after the previous match, improving performance for repeated inline patterns (#1619).
• Officially support Python 3.15 and drop support for Python 3.10
• Walk backtick runs in BacktickInlineProcessor without a regex (#1620).
• Switch static site generator for documentation from MkDocs to Zensical (#1627, #1635, #1637, and #1638).

Fixed

• Ensure removing Abbreviations does not raise an error (#1634).
• Fix an issue with excessive backtracking when matching inline code blocks (#1617).
• md_in_html now honors tags added to Markdown.block_level_elements after the extension is loaded (#1246).
• Fix quadratic-time regex backtracking in ReferenceProcessor when a link reference definition has no URL, e.g. a line consisting only of [id]: followed by many trailing spaces (#798).
• Document attr_list usage for def_list (#1123).

Release 3.10.3

Fixed

• Fix SetextHeaderProcessor regex to prevent mixed = and - chars in setext-style headers (#1606).
• Add AI Policy to Contributing Guide.
• Officially document all included extensions as being in maintenance mode.
• Link the Extension API documentation to the API Reference (#1612).

Release 3.10.2

Fixed

• Fix a regression related to comment handling (#1590).
• More reliable fix for </ (#1593).

Release 3.10.1

Fixed

• Ensure nested elements inside inline comments are properly unescaped (#1571).

... (truncated)

Changelog

Sourced from markdown's changelog.

[3.11.1] - 2026-10-13

Fixed

• Update serializer to be non-recursive (#1644).
• Improve ancestor handling in the inline Treeprocessor (#1646).
• Keep a raw HTML comment inside an inline HTML element that closes in the same paragraph, instead of splitting the paragraph around it (#1643).
• Fix issue where inline HTML attributes were rejected if they had < or > in the attribute (#1647).
• Fix issue where an unterminated end tag (</foo) could cause all remaining content to be dropped (#1651).
• Complete rework of emphasis handling to improve nested emphasis handling better (#1632).

[3.11.0] - 2026-09-25

Changed

• Inline processors now resume searching after the previous match, improving performance for repeated inline patterns (#1619).
• Officially support Python 3.15 and drop support for Python 3.10
• Walk backtick runs in BacktickInlineProcessor without a regex (#1620).
• Switch static site generator for documentation from MkDocs to Zensical (#1627, #1635, #1637, and #1638).

Fixed

• Ensure removing Abbreviations does not raise an error (#1634).
• Fix an issue with excessive backtracking when matching inline code blocks (#1617).
• md_in_html now honors tags added to Markdown.block_level_elements after the extension is loaded (#1246).
• Fix quadratic-time regex backtracking in ReferenceProcessor when a link reference definition has no URL, e.g. a line consisting only of [id]: followed by many trailing spaces (#798).
• Document attr_list usage for def_list (#1123).

[3.10.3] - 2026-07-30

Fixed

• Fix SetextHeaderProcessor regex to prevent mixed = and - chars in setext-style headers (#1606).
• Add AI Policy to Contributing Guide.
• Officially document all included extensions as being in maintenance mode.
• Link the Extension API documentation to the API Reference (#1612).

[3.10.2] - 2026-02-09

Fixed

• Fix a regression related to comment handling (#1590).
• More reliable fix for </ (#1593).

... (truncated)

Commits

• 2258b48 Bump version to 3.11.1
• 6f825aa Rewrite emphasis handling
• 0bf535b Keep a comment inside raw inline HTML in the same paragraph
• 3ade80d Add playground to docs
• ee57673 docs/extensions/tables.md: Fix header formatting
• 7c265bc Ensure that unterminated HTML tags do not cause text to be dropped
• 7a29324 Fix inline HTML case
• 3002575 Fix ancestor handling
• b2125da Serialize HTML non-recursively
• 0ffbf00 Bump version to 3.11.0
• Additional commits viewable in compare view

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PR title: Bump markdown from 3.9 to 3.11.1
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