🌱 Bump lxml from 4.9.3 to 5.1.0 (#585)

Bumps [lxml](https://github.com/lxml/lxml) from 4.9.3 to 5.1.0.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.9.3...lxml-5.1.0)

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

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

docs/requirements.txt

@@ -8,7 +8,7 @@ cssselect==1.2.0
 ghp-import==2.1.0
 idna==3.4
 Jinja2==3.1.3
-lxml==4.9.3
+lxml==5.1.0
 Markdown==3.5.2
 markdown2==2.4.10
 MarkupSafe==2.1.3