Remove devstack-gate requirement

devstack-gate has been retired, remove it from the
'required-projects' section of job definitions.

Depends-on: https://review.opendev.org/c/openstack/neutron-fwaas/+/920709
Change-Id: I6328ed3b62f6ff462fd49ae6df4b78c797956a4e
diff --git a/zuul.d/master_jobs.yaml b/zuul.d/master_jobs.yaml
index d47ff64..e51e419 100644
--- a/zuul.d/master_jobs.yaml
+++ b/zuul.d/master_jobs.yaml
@@ -1217,7 +1217,6 @@
     parent: neutron-tempest-plugin-base
     timeout: 10800
     required-projects:
-      - openstack/devstack-gate
       - openstack/neutron-fwaas
       - openstack/neutron
       - openstack/neutron-tempest-plugin
@@ -1415,7 +1414,6 @@
     roles:
       - zuul: openstack/devstack
     required-projects:
-      - openstack/devstack-gate
       - openstack/neutron
       - openstack/neutron-tempest-plugin
       - openstack/tap-as-a-service