Update python-dateutil requirement from ==2.8.* to ==2.9.* (#3950)

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](https://github.com/dateutil/dateutil/compare/2.8.0...2.9.0)

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

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pyproject.toml

@@ -84,7 +84,7 @@ dependencies = [
   "pycryptodome==3.20.*",
   "pypdf==3.9.*",
   "python-bidi==0.4.*",  # Support for Arabic in reportlab
-  "python-dateutil==2.8.*",
+  "python-dateutil==2.9.*",
   "pytz",
   "pytz-deprecation-shim==0.1.*",
   "pyuca",