zuul: Use openstack-python3-next-jobs template

Test the project against the latest and greatest Python versions.

Change-Id: Ia8c36c720b440435d7e3618ba7d7392481c2c207
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

Author: stephenfin

.zuul.yaml

@@ -1,12 +1,13 @@
 ---
+
 - job:
     name: osc-tox-unit-tips
     parent: openstack-tox
     description: |
       Run unit tests for OpenStackClient with master branch of important libs.
 
       Takes advantage of the base tox job's install-siblings feature.
-    irrelevant-files: &common-irrelevant-files
+    irrelevant-files:
       - ^.*\.rst$
       - ^doc/.*$
       - ^releasenotes/.*$
@@ -168,6 +169,7 @@
       - osc-tox-unit-tips
       - openstack-cover-jobs
       - openstack-python3-jobs
+      - openstack-python3-next-jobs
       - publish-openstack-docs-pti
       - check-requirements
       - release-notes-jobs-python3