chore(deps): bump mistune in /docs in the pip group across 1 directory

Bumps the pip group with 1 update in the /docs directory: [mistune](https://github.com/lepture/mistune).


Updates `mistune` from 3.2.0 to 3.2.1
- [Release notes](https://github.com/lepture/mistune/releases)
- [Changelog](https://github.com/lepture/mistune/blob/main/docs/changes.rst)
- [Commits](lepture/mistune@v3.2.0...v3.2.1)

---
updated-dependencies:
- dependency-name: mistune
  dependency-version: 3.2.1
  dependency-type: indirect
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]