Merge pull request #1258 from Libensemble/dependabot/pip/develop/python-dateutil-2.9.0.post0

Bump python-dateutil from 2.8.2 to 2.9.0.post0

Author: jmlarson1

install/testing_requirements.txt

@@ -4,6 +4,6 @@ pytest==8.0.2
 pytest-cov==4.1.0
 pytest-timeout==2.2.0
 mock==5.1.0
-python-dateutil==2.8.2
+python-dateutil==2.9.0.post0
 anyio==4.3.0
 matplotlib==3.8.3