chore(deps-dev): bump lxml from 4.8.0 to 4.9.0 (#241)

Bumps [lxml](https://github.com/lxml/lxml) from 4.8.0 to 4.9.0.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.8.0...lxml-4.9.0)

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

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Author: dependabot[bot]