build(deps): bump lxml from 5.1.0 to 5.1.1

Bumps [lxml](https://github.com/lxml/lxml) from 5.1.0 to 5.1.1.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-5.1.0...lxml-5.1.1)

---
updated-dependencies:
- dependency-name: lxml
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -59,7 +59,7 @@ humanize==4.9.0
 idna==3.6
 itsdangerous==2.1.2
 Jinja2==3.1.3
-lxml==5.1.0
+lxml==5.1.1
 MarkupSafe==2.1.5
 mf2py==2.0.1
 mf2util==0.5.2