Use python job template for Zed

... because the current master should be compatible with the Zed
release of the other projects. This effectively removes testing on
Python 3.6 and only Python 3.8 and 3.9 will be tested.

Closes-Bug: #1974244
Change-Id: I7ceafe711d15a185704eae50852649798c94ccab

zuul.d/layout.yaml

@@ -5,7 +5,7 @@
       - check-requirements
       - release-notes-jobs-python3
       - tripleo-standalone-scenarios-pipeline
-      - openstack-python3-yoga-jobs
+      - openstack-python3-zed-jobs
       - tripleo-standalone-multinode-ipa-pipeline
       - tripleo-upgrades-master-pipeline
       - tripleo-periodic-upgrades-master-pipeline