build(deps): update python-dateutil requirement from <2.9 to <2.10

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@2.1...2.9.0.post0)

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

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

setup.py

@@ -30,7 +30,7 @@
     install_requires=[
         "dogpile.cache<1.4",
         "importlib-metadata; python_version<'3.8'",
-        "python-dateutil<2.9",
+        "python-dateutil<2.10",
         "requests>=2.27,<3",
         "six<2",
     ],