zuul: Declare queue at top level

Zuul deprecated declaring shared queues at a pipeline level with
release 4.1.0[1]. This updates the job definition to use the top level
declaration instead.

See [2] for details.

[1] https://zuul-ci.org/docs/zuul/latest/releasenotes.html#relnotes-4-1-0-deprecation-notes
[2] http://lists.openstack.org/pipermail/openstack-discuss/2022-May/028603.html

Change-Id: I07d9f3758243df89ef4ccd482ae0ee3e49e5f88f
diff --git a/.zuul.yaml b/.zuul.yaml
index 8b56037..f71e374 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -1,4 +1,5 @@
 - project:
+    queue: barbican
     templates:
       - tempest-plugin-jobs
       - check-requirements
@@ -14,7 +15,6 @@
         - barbican-tempest-plugin-simple-crypto-castellan-src
         - barbican-tempest-plugin-simple-crypto-cursive
     gate:
-      queue: barbican
       jobs:
         - barbican-tempest-plugin-simple-crypto