Use FQCN of ansible.builtin.assert in Tempest runner host check.

Author: maxstack

etc/kayobe/ansible/stackhpc-cloud-tests.yml

@@ -15,7 +15,7 @@
     - name: Stackhpc Cloud tests
       block:
         - name: Assert that there is only one host in the tempest_runner group
-          assert:
+          ansible.builtin.assert:
             that: groups.get('tempest_runner', []) | length == 1
             fail_msg: The tempest_runner group should contain exactly one host