Bump lxml from 4.8.0 to 4.9.1 (#326)

Bumps [lxml](https://github.com/lxml/lxml) from 4.8.0 to 4.9.1.
- [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-4.9.1)

---
updated-dependencies:
- dependency-name: lxml
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

requirements.txt

@@ -16,7 +16,7 @@ iniconfig==1.1.1
 isort==5.10.1
 keyring==23.3.0
 lazy-object-proxy==1.7.1
-lxml==4.8.0
+lxml==4.9.1
 mccabe==0.6.1
 mypy-extensions==0.4.3
 packaging==21.3