Fix cert-manager E305 ansible-lint error (#6549)

roles/kubernetes-apps/ingress_controller/cert_manager/tasks/main.yml

@@ -68,7 +68,7 @@
     - inventory_hostname == groups['kube-master'][0]
 
 - name: Cert Manager | Wait for Webhook pods become ready
-  shell: "{{ bin_dir }}/kubectl wait po --namespace={{ cert_manager_namespace }} --selector app=webhook --for=condition=Ready --timeout=600s"
+  command: "{{ bin_dir }}/kubectl wait po --namespace={{ cert_manager_namespace }} --selector app=webhook --for=condition=Ready --timeout=600s"
   register: cert_manager_webhook_pods_ready
   when: inventory_hostname == groups['kube-master'][0]