Update docs/requirements.txt

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mkdocstrings (changelog)	==0.26.1 -> ==0.26.2
pymdown-extensions	==10.11.2 -> ==10.12

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Release Notes

mkdocstrings/mkdocstrings (mkdocstrings)

v0.26.2

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• Drop support for Python 3.8 (f26edeb by Timothée Mazzucotelli).

facelessuser/pymdown-extensions (pymdown-extensions)

v10.12

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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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