Make centos 9 stream jobs non-voting

... because these are now broken by a bug in libvirt 9.10.0[1].

[1] https://issues.redhat.com/browse/RHEL-20609

Change-Id: I3436d30db7538d406de996dc16202fab4407b07c

.zuul.yaml

@@ -122,6 +122,7 @@
     parent: telemetry-dsvm-integration
     description: |
       Telemetry devstack tempest tests job for a Centos 9 stream system
+    voting: false
 
 - job:
     name: telemetry-dsvm-integration-centos-9s-fips
@@ -131,6 +132,7 @@
     pre-run: playbooks/enable-fips.yaml
     vars:
       nslookup_target: 'opendev.org'
+    voting: false
 
 - project:
     queue: telemetry