Improving yamllint configuration (#11389)

Signed-off-by: Bas Meijer <bas.meijer@enexis.nl>

roles/kubernetes/control-plane/tasks/kubeadm-secondary.yml

@@ -34,7 +34,7 @@
   template:
     src: "kubeadm-controlplane.{{ kubeadmConfig_api_version }}.yaml.j2"
     dest: "{{ kube_config_dir }}/kubeadm-controlplane.yaml"
-    mode: 0640
+    mode: "0640"
     backup: yes
   when:
     - inventory_hostname != first_kube_control_plane
@@ -77,7 +77,7 @@
     dest: "{{ kube_config_dir }}/cluster-info-discovery-kubeconfig.yaml"
     content: "{{ kubeconfig_file_discovery.stdout }}"
     owner: "root"
-    mode: 0644
+    mode: "0644"
   when:
     - inventory_hostname != first_kube_control_plane
     - kubeadm_use_file_discovery