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Python 3.8 is no longer part of the tested runtimes for 2024.2 [1] because its EOL is coming soon. Python >= 3.9 provides the zoneinfo module to manipulate timezones. This change replaces the usage of pytz, which was an implicit dependency recently removed from Horizon [2]. [1] https://governance.openstack.org/tc/reference/runtimes/2024.2.html [2] https://review.opendev.org/c/openstack/horizon/+/921651 Change-Id: If1f6627047787ae1965d5e66a2e73ad539a44039