Update mistune requirement from <2 to <4

[dependabot[bot]]

Updates the requirements on mistune to permit the latest version.

Release notes

Sourced from mistune's releases.

v3.0.2

   🐞 Bug Fixes

• Fix RecursionError for lists  -  by @​lepture (44cc6)

    View changes on GitHub

Changelog

Sourced from mistune's changelog.

Version 3.0.2

Released on Sep 30, 2023

• Fix list parser to avoid RecursionError

Version 3.0.1

Released on Jun 10, 2023

• Add py.typed for mypy
• Add tests, docs for sdist
• Support renderer="ast" for rendering AST

Version 3.0.0

Released on Jun 08, 2023

• Do not strip leading unicode spaces like emsp
• Ensure new line at end of the text

Version 3.0.0rc5

Released on Mar 22, 2023

• Fix fenced directives
• Fix inline link parser
• Fix block math plugin for multiple lines
• Fix empty list item for markdown renderer

Version 3.0.0rc4

Released on Nov 30, 2022

• Fix plugin footnotes when there is no newline at the end
• Move safe HTML entities to HTMLRenderer
• Redesign directives parsing
• Add Image and Figure directive

Version 3.0.0rc3

Released on Nov 25, 2022

• Render inline math with \( and \)

... (truncated)

Commits

• f997c86 chore: release 3.0.2
• 44cc62b fix: fix RecursionError for lists
• 68a2814 docs: update migrating guide for plugins renderer
• b81197d chore: update docs
• 7f6bd7c chore: release 3.0.1
• 3518067 chore: replace importing of Match from typing
• fc19c49 fix: renderer="ast" same as render=None (#351)
• d65a097 fix: include more files in sdist explicitly (#350)
• 777db05 feat: add py.typed for mypy
• 8df3d1c Please add py.typed so mypy will use and respect type annotations in mistune ...
• Additional commits viewable in compare view

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (09efa26) 79.02% compared to head (6cd443a) 79.02%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #374 +/- ## ======================================= Coverage 79.02% 79.02% ======================================= Files 39 39 Lines 4157 4157 Branches 602 602 ======================================= Hits 3285 3285 Misses 676 676 Partials 196 196 ```

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