Update lxml requirement from ~=4.9.3 to >=4.9.3,<5.1.0

Updates the requirements on [lxml](https://github.com/lxml/lxml) to permit the latest version.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.9.3...lxml-5.0.0)

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

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

pyproject.toml

@@ -49,7 +49,7 @@ test = [
     "Flask<4",
     "GitPython<4",
     "Jinja2~=3.1.2",
-    "lxml~=4.9.3",
+    "lxml>=4.9.3,<5.1.0",
     "mock==5.1.*",
     "pre-commit<4",
     "Pyjwt~=2.8.0",