Mark devstack-platform-centos-9-stream as n-v

Due to the below bug the job has been constantly failing.
Let's make it n-v until the bug is resolved:
  - https://bugs.launchpad.net/neutron/+bug/1979047

Change-Id: Ifc8cc96843a8eac5c98cd1e1f9e4b6287a7f2e7c

.zuul.yaml

@@ -661,6 +661,9 @@
     description: CentOS 9 Stream platform test
     nodeset: devstack-single-node-centos-9-stream
     timeout: 9000
+    # TODO(kopecmartin) n-v until the following is resolved:
+    # https://bugs.launchpad.net/neutron/+bug/1979047
+    voting: false
     vars:
       configure_swap_size: 4096
 
@@ -896,7 +899,9 @@
       jobs:
         - devstack
         - devstack-ipv6
-        - devstack-platform-centos-9-stream
+        # TODO(kopecmartin) n-v until the following is resolved:
+        # https://bugs.launchpad.net/neutron/+bug/1979047
+        # - devstack-platform-centos-9-stream
         - devstack-platform-ubuntu-jammy
         - devstack-enforce-scope
         - devstack-multinode