zuul: Use openstack-python3-next-jobs template

Test the project against the latest and greatest Python versions.

Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
Change-Id: I1ff97f0821ff6c2212a73cd0e5d08e3af6315e72
Depends-on: https://review.opendev.org/c/openstack/openstack-zuul-jobs/+/993337/

.zuul.yaml

@@ -3,6 +3,7 @@
       - check-requirements
       - lib-forward-testing-python3
       - openstack-python3-jobs
+      - openstack-python3-next-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3