Update lxml requirement from ~4.9 to ~5.0

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-4.9.0...lxml-5.0.0)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -7,7 +7,7 @@ license = "MIT"
 
 [tool.poetry.dependencies]
 python = "^3.9"
-lxml = "~4.9"
+lxml = "~5.0"
 pyopenmensa = "~0.95"
 requests = "~2.31"
 deepl = "^1.2.1"