Fixed joined_control_planes when ansible_hostvars references a variable (#11060)

roles/kubernetes/control-plane/tasks/define-first-kube-control.yml

@@ -9,7 +9,7 @@
 - name: Set fact joined_control_planes
   set_fact:
     joined_control_planes: "{{ ((kube_control_planes_raw.stdout | from_json)['items']) | default([]) | map(attribute='metadata') | map(attribute='name') | list }}"
-  delegate_to: item
+  delegate_to: "{{ item }}"
   loop: "{{ groups['kube_control_plane'] }}"
   when: kube_control_planes_raw is succeeded
   run_once: yes