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

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


Updates `lxml` from 6.0.2 to 6.1.0
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-6.0.2...lxml-6.1.0)

---
updated-dependencies:
- dependency-name: lxml
  dependency-version: 6.1.0
  dependency-type: indirect
  dependency-group: pip
...

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Author: dependabot[bot]