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

nawawi/openstack,nawawi/openstack