chore: bump pymdown-extensions from 10.16.1 to 10.21.3

[dependabot]

Bumps pymdown-extensions from 10.16.1 to 10.21.3.

Release notes

Sourced from pymdown-extensions's releases.

10.21.3

• FIX: Fix regression that allows a snippet to be loaded outside of the base path using directory traversal when restrict_base_path is enabled (the default). Found by @​gistrec.

10.21. 2

10.21.2

• FIX: Highlight: Latest Pygments versions cannot handle a "filename" for code block titles of None.

10.20.1

• FIX: Quotes: Ensure the first class for callouts (the alert type) is always rendered lowercase.

10.21

• NEW: Caption: Add support for specifying not only IDs but classes and arbitrary attributes. Initial work by @​joapuiib.
• FIX: MagicLink: Fix a matching pattern for Bitbucket repo.

10.20

• NEW: Quotes: New blockquotes extension added that uses a more modern approach when compared to Python Markdown's default. Quotes specifically will not group consecutive blockquotes together in the same lazy fashion that the default Python Markdown does which follows a more modern trend to how parsers these days handle block quotes.

  In addition, Quotes also provides an optional feature to enable specifying callouts/alerts in the style used by GitHub and Obsidian.

10.19.1

• FIX: Arithmatex: Fix issue where block $$ math used inline within a paragraph could result in nested math parsing.

10.19

• NEW: Emoji: Update Twemoji to use Unicode 16.
• NEW: Critic: Roll back view mode deprecation as some still like to use it, though further enhancements to this mode are not planned.

10.18

• NEW: Critic: view mode has been deprecated. To avoid warnings or future issues, explicitly set mode to either accept or reject. In the future, the new default will be accept and the view mode will be removed entirely.
• FIX: Block Admonition: important should have always been available as a default.

10.17.2

• FIX: Blocks: Blocks extensions will now better handle nesting of indented style Admonitions, Details, and Tabbed

... (truncated)

Commits

• 4262841 Fix spelling
• 63b7835 Merge commit from fork
• 3d18550 Docs: update js deps
• a4fdd73 Skip tag 10.21.1 has we accidentally already used it
• 8afb4cd Docs: Update JS deps
• 7bf5b29 Pygments needs a non-None value for code block title (#2863)
• 20b11eb Fix some spelling and formatting
• c9edba3 Docs: strengthen Snippets warning and add security considerations
• 6d92b68 Bump version
• baeca0e Docs: update JS deps
• Additional commits viewable in compare view