Update lxml requirement from <5.0.0,>=3.4.1 to >=3.4.1,<6.0.0

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-3.4.1...lxml-5.3.0)

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

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

pyproject.toml

@@ -58,7 +58,7 @@ dependencies = [
     "google-api-python-client>=1.7.9",
     "iso8601>=0.1",
     "jsonpatch>=1.23",
-    "lxml>=3.4.1,<5.0.0",
+    "lxml>=3.4.1,<6.0.0",
     "mammoth>=1.4.4",
     "natsort>=8.3",
     "requests>=2",