Bump lxml from 4.6.5 to 6.1.0

Bumps [lxml](https://github.com/lxml/lxml) from 4.6.5 to 6.1.0.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.6.5...lxml-6.1.0)

---
updated-dependencies:
- dependency-name: lxml
  dependency-version: 6.1.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 requests>=2.5.0,<3.0
 websocket-client==0.44.0
 beautifulsoup4==4.6.0
-lxml==4.6.5
+lxml==6.1.0
 jinja2>=2.10.1
 slackclient==1.3.1
 slack_sdk==3.34.0