Fix Zuul shared queue config.

The current queue config is deprecated and will be removed in the next
major zuul release. Update to ensure windmill uses correct config.

More info can be found on the zuul mailing list:
  https://lists.zuul-ci.org/pipermail/zuul-discuss/2022-May/001801.html

Change-Id: I6d059710911fadc80b86bf2ebbad9527c372c5fa

.zuul.yaml

@@ -1,4 +1,5 @@
 - project:
+    queue: vmware-nsx
     templates:
       - build-openstack-docs-pti
       - check-requirements
@@ -63,7 +64,6 @@
               - openstack/octavia
             voting: false
     gate:
-      queue: vmware-nsx
       jobs:
         - openstack-tox-pep8:
             required-projects: