Bump lxml from 4.9.0 to 6.1.0

Bumps [lxml](https://github.com/lxml/lxml) from 4.9.0 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-4.9.0...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-oldest.txt

@@ -16,7 +16,7 @@ lxml==3.8.0 ; python_version < '3.7'
 # - 3.8 is actually 4.3.5
 # - 3.9-3.10 is actually 4.5.2
 # - 3.11 is actually 4.9.0
-lxml==4.9.0 ; python_version >= '3.7'
+lxml==6.1.0 ; python_version >= '3.7'
 
 # requirements-test.txt
 flake8==3.9.2 ; python_version < '3.6'