Update types-python-dateutil requirement

Updates the requirements on [types-python-dateutil](https://github.com/python/typeshed) to permit the latest version.
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-python-dateutil
  dependency-version: 2.9.0.20241206
  dependency-type: direct:production
...

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Author: dependabot[bot]

test-requirements.txt

@@ -2,5 +2,5 @@ pytest >= 7.2.1
 pytest-cov >= 2.8.1
 tox >= 3.9.0
 flake8 >= 4.0.0
-types-python-dateutil >= 2.8.19.14
+types-python-dateutil >= 2.9.0.20241206
 mypy >= 1.5