Bump pymdown-extensions from 10.11.2 to v10.12

[dghubble-renovate]

This PR contains the following updates:

Package	Update	Change
pymdown-extensions	minor	==10.11.2 -> ==10.12

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Release Notes

facelessuser/pymdown-extensions (pymdown-extensions)

v10.12

Compare Source

10.12

• NEW: Blocks: Blocks extensions no longer considered in beta.
• NEW: Details: Details is marked as "legacy" in documentation in favor of the new pymdownx.blocks.details approach.
• NEW: Tabbed: Tabbed is marked as "legacy" in documentation in favor of the new pymdownx.blocks.tab approach.
• NEW: Caption: Add new "blocks" style extension called Caption which helps with specifying figures with captions.
• NEW: Emoji: Add a new strict option that will raise an exception if an emoji is used whose name has changed,
  removed, or never existed.
• FIX: Emoji: Emoji links should be generated such that they point to the new CDN version.

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