Update mistune requirement from >=3.2.0 to >=3.3.4 in /doc

[dependabot]

Updates the requirements on mistune to permit the latest version.

Release notes

Sourced from mistune's releases.

v3.3.4

   🐞 Bug Fixes

• Improve parsing for edge cases  -  by @​lepture (53412)
• Improve inline parser by learning from wenmode  -  by @​lepture (37bb7)
• Prevent deep alt parsing  -  by @​lepture (b77ee)
• def_list: A tab after the ':' marker no longer makes the definition a code block  -  by @​chuenchen309 and Claude Opus 4.8 (7aa49)
• table: Reject a non-delimiter second row instead of eating it  -  by @​chuenchen309 and Claude Opus 4.8 (86f9f)

   🏎 Performance

• Optimize inline edge-case parsing  -  by @​lepture (b4dd3)

    View changes on GitHub

Changelog

Sourced from mistune's changelog.

Version 3.3.4

Released on Jul 22, 2026

• Harden inline parsing against deeply nested and adversarial link, image, emphasis, formatting, math, and reference inputs.
• Improve performance for repeated link suffixes, dense emphasis, unclosed formatting markers, inline spoilers, and adjacent ruby tokens.
• Refactor the inline parser into dedicated emphasis and link modules.
• Escape literal */_ emphasis markers in the Markdown renderer so round-tripping escaped text does not re-introduce emphasis.

Version 3.3.3

Released on Jul 9, 2026

• Limit deeply nested emphasis and image parsing to avoid RecursionError.
• Fix repeated link suffix and unclosed formatting marker performance issues.
• Fix unclosed inline spoiler performance issues.
• Avoid recursive parsing for adjacent ruby tokens.
• Speed up footnote reference indexing.

Version 3.3.2

Released on Jun 23, 2026

• Fix Python 3.8 import compatibility in the inline parser.
• Fix mypy compatibility for list parsing on Python 3.8 and 3.9+.

Version 3.3.1

Released on Jun 22, 2026

• Fix abbr plugin compatibility with escaped inline text.
• Normalize included Markdown line endings before parsing directives.

Version 3.3.0

Released on Jun 21, 2026

• Improve CommonMark compatibility and parser performance.
• Add command line entrypoint with UTF-8 output.
• Support display and backtick math.
• Render plugin list and table nodes in Markdown renderer.
• Escape leading block markers in Markdown renderer.

... (truncated)

Commits

• 69ec2b8 chore: release 3.3.4
• 234aa25 test: more deadline for pypy
• b77ee58 fix: prevent deep alt parsing
• 66b2171 refactor: expose entity boundary helper
• 30ef44b refactor: move link token construction
• 3066209 refactor: require explicit emphasis depth
• 0396492 refactor: split inline parser modules
• 80b3e85 refactor: isolate inline parser state bounds
• 7b0194c test: cover inline performance edge cases
• b4dd328 perf: optimize inline edge-case parsing
• Additional commits viewable in compare view

[Copilot]

🟢 Approval recommended

The focused dependency update is compatible with the existing documentation build configuration.

0 open findings

What changed in this PR

Raises the documentation toolchain’s minimum Mistune version to 3.3.4.

Changes:

• Updates the Mistune requirement from >=3.2.0 to >=3.3.4.

File	Description
doc/​requirements.txt	Raises the minimum Mistune version used for documentation builds.

🧠 Review effort: Balanced

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