Switch openstack-python3-zed-jobs

In Zed, we decrepated the py36/py37 job, and this patch need to change
with zed job[1].

[1]https://opendev.org/openstack/openstack-zuul-jobs/src/branch/master/zuul.d/project-templates.yaml#L504

Change-Id: Ia467087f1b48d158ce6f91dd461138ff514a8c80

.zuul.yaml

@@ -4,18 +4,15 @@
       - check-requirements
       - release-notes-jobs-python3
       - publish-openstack-docs-pti
+      - openstack-python3-zed-jobs
     check:
       jobs:
-        - openstack-tox-pep8
         - cyborg-tempest
         - cyborg-tempest-ipv6-only
         - cyborg-tox-bandit
-        - openstack-tox-py38
     gate:
       jobs:
-        - openstack-tox-pep8
         - cyborg-tempest
-        - openstack-tox-py38
 
 - job:
     name: cyborg-tox-bandit