chore(deps-dev): update python-dateutil requirement from ~=2.8 to ~=2.9 (#967)

Updates the requirements on [python-dateutil](https://github.com/dateutil/dateutil) to permit the latest version.
- [Release notes](https://github.com/dateutil/dateutil/releases)
- [Changelog](https://github.com/dateutil/dateutil/blob/master/NEWS)
- [Commits](dateutil/dateutil@2.8.0...2.9.0)

---
updated-dependencies:
- dependency-name: python-dateutil
  dependency-type: direct:development
...

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Pipfile

@@ -14,7 +14,7 @@ pylint = "~=3.1.0"
 pylint-quotes = "~=0.2.3"
 pytest = "~=8.0"
 pytest-cov = "~=4.1"
-python-dateutil = "~=2.8"
+python-dateutil = "~=2.9"
 tox = "~=4.12"
 types-python-dateutil = "~=2.8"