Bump lxml from 4.8.0 to 4.9.0 (#665)

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: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>
Co-authored-by: Willem <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -10,7 +10,7 @@ requests==2.27.1
 pyIsEmail==1.4.0
 GitPython==3.1.27
 xmltodict==0.13.0
-lxml==4.8.0
+lxml==4.9.0
 pytz==2021.3
 tzlocal==4.1
 libvirt-python==7.1.0; sys_platform != 'win32'