zuul: reorder python jobs

Change-Id: I912debb19e58fcf8a30a8c0c52f96ae4e51e1327
Signed-off-by: Adrian Vladu <avladu@cloudbasesolutions.com>

Author: ader1990

.zuul.yaml

@@ -1,8 +1,8 @@
 - project:
     templates:
+      - openstack-python3-jobs
       - openstack-cover-jobs
       - build-openstack-docs-pti
-      - openstack-python3-jobs
       - build-release-notes-jobs-python3
     post:
       jobs: