Bump types-python-dateutil from 2.9.0.20240821 to 2.9.0.20240906 (#65)

Bumps [types-python-dateutil](https://github.com/python/typeshed) from
2.9.0.20240821 to 2.9.0.20240906.
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Author: Marenz

pyproject.toml

@@ -74,7 +74,7 @@ dev-mypy = [
   "mypy == 1.11.2",
   "grpc-stubs == 1.53.0.5",               # This dependency introduces breaking changes in patch releases
   "types-Markdown == 3.7.0.20240822",
-  "types-python-dateutil==2.9.0.20240821",
+  "types-python-dateutil==2.9.0.20240906",
   # For checking the noxfile, docs/ script, and tests
   "frequenz-dispatch[dev-mkdocs,dev-noxfile,dev-pytest]",
 ]