Bump lxml from 4.8.0 to 4.9.0

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](https://github.com/lxml/lxml/compare/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] <support@github.com>

requirements.txt

@@ -1,7 +1,7 @@
 PlexAPI==4.11.2
 tmdbapis==1.0.4
 arrapi==1.3.1
-lxml==4.8.0
+lxml==4.9.0
 requests==2.27.1
 ruamel.yaml==0.17.21
 schedule==1.1.0