build(deps): bump lxml from 5.3.1 to 5.4.0 in /docs (#3311)

Bumps [lxml](https://github.com/lxml/lxml) from 5.3.1 to 5.4.0.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-5.3.1...lxml-5.4.0)

---
updated-dependencies:
- dependency-name: lxml
  dependency-version: 5.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]