chore(deps): update docs/requirements.txt

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mkdocstrings (changelog)	==0.19.1 -> ==0.20.0
pymdown-extensions	==9.9 -> ==9.9.2

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Release Notes

mkdocstrings/mkdocstrings

v0.20.0

Compare Source

Compare with 0.19.1

Features

• Add enabled configuration option (8cf117d by StefanBRas). Issue #​478, PR #​504

Bug Fixes

• Handle updating Jinja environment of multiple handlers (a6ea80c by David Patterson). Related PR #​201, Issue #​502, PR #​507

Code Refactoring

• Make _load_inventory accept lists as arguments (105ed82 by Sorin Sbarnea). Needed by PR mkdocstrings/python#​49, PR #​511
• Remove support for MkDocs < 1.2 (we already depended on MkDocs >= 1.2) (ac963c8 by Timothée Mazzucotelli).

facelessuser/pymdown-extensions

v9.9.2

Compare Source

9.9.2

• FIX: Snippets syntax can break in XML comments as XML comments do not allow --. Relax Snippets syntax such that
  -8<- (single -) are allowed.

v9.9.1

Compare Source

9.9.1

• FIX: Use a different CDN for Twemoji icons as MaxCDN is no longer available.

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