Switch testing to Victoria testing runtime

Upating the testing template from ussuri to victoria
testing runtime
- https://governance.openstack.org/tc/reference/runtimes/victoria.html

Change-Id: Ifd65c0359509a4b59f3e876c42cef7cbf6f9ef93
diff --git a/.zuul.yaml b/.zuul.yaml
index 2945031..fc43d97 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -183,7 +183,7 @@
     templates:
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python3-ussuri-jobs
+      - openstack-python3-victoria-jobs
       - check-requirements
       - publish-openstack-docs-pti
       - release-notes-jobs-python3