Update dependency pymdown-extensions to v10.21

[slack-oss-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
pymdown-extensions	==10.12 → ==10.21

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Release Notes

facelessuser/pymdown-extensions (pymdown-extensions)

v10.21

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.

v10.20

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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.

v10.19.1

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10.19.1

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

v10.19

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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.

v10.18

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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.

v10.17.2

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10.17.2

• FIX: Blocks: Blocks extensions will now better handle nesting of indented style Admonitions, Details, and Tabbed
  and other non-conflicting blocks.

v10.17.1

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10.17.1

• FIX: Fix an issue where Highlight can override another extension in the "registered" list in Python Markdown.

v10.17

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10.17

• NEW: Allow specifying static IDs in caption block headers via #id syntax.

v10.16.1: 10.6.1

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10.16.1

• FIX: Inefficient regular expression pattern for figure caption numbers.

v10.16

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10.16

• NEW: Add early support for Python 3.14.
• NEW: Drop support for Python 3.8.
• NEW: Snippets: Added max_retries and backoff_retries options to configure new retry logic for HTTP 429
  errors (Too Many Requests client error).
• NEW: Caption: Prefix templates are now preserved exactly as specified allowing the insertion of HTML tags if
  desired.
• FIX: Caption: Fix issue where manual numbers in auto were not respected appropriately.

v10.15

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10.15.0

• NEW: SuperFences: Add relaxed_headers option which can tolerate bad content in the fenced code header. When
  enabled, code blocks with bad content in the header will likely still convert into code blocks, often respecting
  the specified language.
• NEW: Add type hints to the Blocks interface and a few additional files.
• FIX: Blocks: Fix some corner cases of nested blocks with lists.
• FIX: Tab and Tabbed: Fix a case where tabs could fail if combine_header_slug was enabled and there was no
  header.

v10.14.3

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10.14.3

• FIX: Blocks: An empty, raw block type should not cause an error.

v10.14.2

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10.14.2

• FIX: Blocks: Fix some corner cases with md_in_html.

v10.14.1

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10.14.1

• FIX: MagicLink: Ensure that repo names that start with . are handled correctly.
• FIX: FancyLists: Fix case were lists could be falsely created when a line started with . or ).

v10.14

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10.14

• NEW: Blocks.HTML: Add new custom option to specify tags and the assumed handling for them when automatic mode
  is assumed. This can also be used to override the handling for recognized tags with automatic handling.
• FIX: Fix tests to pass with Pygments 2.19+.

v10.13

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10.13

• NEW: Snippets: Allow multiple line numbers or line number blocks separated by ,.
• NEW: Snippets: Allow using a negative index for number start indexes and end indexes. Negative indexes are converted to positive indexes based on the number of lines in the snippet.
• FIX: Snippets: Properly capture empty newline at end of file.
• FIX: Snippets: Fix issue where when non sections of files are included, section labels are not stripped.
• FIX: BetterEm: Fixes for complex cases.
• FIX: Blocks: More consistent handling of empty newlines in block processor extensions.

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