CI: Make SLURP jobs non-voting

At least until we get to the bottom of the rabbitmq SLURP upgrade
issues[1].

[1] https://bugs.launchpad.net/kolla-ansible/+bug/2058512

Change-Id: I4778d41fd18665c25b635e761cddb7b3bfd1560f

zuul.d/project.yaml

@@ -20,8 +20,10 @@
         - kayobe-overcloud-host-configure-ubuntu-jammy
         - kayobe-overcloud-upgrade-rocky9
         - kayobe-overcloud-upgrade-ubuntu-jammy
-        - kayobe-overcloud-upgrade-slurp-rocky9
-        - kayobe-overcloud-upgrade-slurp-ubuntu-jammy
+        - kayobe-overcloud-upgrade-slurp-rocky9:
+            voting: false
+        - kayobe-overcloud-upgrade-slurp-ubuntu-jammy:
+            voting: false
         - kayobe-seed-rocky9
         - kayobe-seed-ubuntu-jammy
         - kayobe-seed-images-rocky9
@@ -47,8 +49,6 @@
         - kayobe-overcloud-host-configure-ubuntu-jammy
         - kayobe-overcloud-upgrade-rocky9
         - kayobe-overcloud-upgrade-ubuntu-jammy
-        - kayobe-overcloud-upgrade-slurp-rocky9
-        - kayobe-overcloud-upgrade-slurp-ubuntu-jammy
         - kayobe-seed-rocky9
         - kayobe-seed-ubuntu-jammy
         - kayobe-seed-upgrade-rocky9