Update dependency pymdown-extensions to v10.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pymdown-extensions	==10.3.1 -> ==10.9

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Release Notes

facelessuser/pymdown-extensions (pymdown-extensions)

v10.9

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10.9

• NEW: Officially support Python 3.13.
• FIX: Snippets: Better handling of cases where URL snippet requests contain no header length.

v10.8.1

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10.8.1

• FIX: Snippets: Fix snippet line range with a start of line 1.

v10.8

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10.8

• NEW: Require Python Markdown 3.6+.
• FIX: Fix some test cases.
• FIX: Fix warnings due to recent changes in Python Markdown.

v10.7.1

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10.7.1

• FIX: SmartSymbols: Ensure symbols are properly translated in table of content tokens.

v10.7

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10.7

• NEW: Emoji: Update Twemoji and Gemoji data to latest.
• NEW: Emoji: Due to recent Gemoji update, non-standard emoji are no longer indexed. So emoji such as :octocat:
  are no longer resolved.
• NEW: Highlight: Added new option default_lang which will cause code blocks with no language specifier to be
  highlighted with the specified default language instead of plain text. This affects indented code blocks and code
  blocks defined with SuperFences.
• NEW: InlineHilite: style_plain_text can be specified with a language string (in addition to its previous
  boolean requirement) to treat inline code blocks with no explicit language specifier with a specific default
  language.

v10.6

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10.6

• NEW: MagicLink: Allow configuring custom repository providers based off the existing providers.

v10.5

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10.5

• NEW: Blocks: Admonitions and Details now allow configuring custom block classes and default titles.
• FIX: Keys: Ensure that Keys does not parse base64 encoded URLs.

v10.4

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10.4

• NEW: Snippets: Allow PathLike objects for base_path to better support interactions with MkDocs.
• FIX: Block Admonitions: Empty titles should be respected.
• FIX: Block Details: Empty summary should be respected.

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