[stable only] Make devstack-platform-rocky-blue-onyx non voting

devstack-platform-rocky-blue-onyx is failing 100% on the newly
created stable/2023.2 branch. Below is the failure while setting
up the devstack for stable/2023.2

https://zuul.opendev.org/t/openstack/build/f25dd57dbf6c491c8b5c1318b4eff5a2

Making it non voting until issue is resolved.

Related-Bug: #2038733
Change-Id: Ibb496353640d179f19b99efcdf0068303476da06

.zuul.yaml

@@ -938,7 +938,10 @@
         - devstack-platform-centos-9-stream
         - devstack-platform-debian-bookworm
         - devstack-platform-debian-bullseye
-        - devstack-platform-rocky-blue-onyx
+        # TODO(gmann): make it voting again once bug#2038733
+        # is fixed.
+        - devstack-platform-rocky-blue-onyx:
+            voting: false
         - devstack-platform-ubuntu-jammy-ovn-source
         - devstack-platform-ubuntu-jammy-ovs
         - devstack-multinode
@@ -981,7 +984,7 @@
         - devstack
         - devstack-ipv6
         - devstack-platform-debian-bullseye
-        - devstack-platform-rocky-blue-onyx
+        # - devstack-platform-rocky-blue-onyx
         - devstack-enforce-scope
         - devstack-multinode
         - devstack-unit-tests