enchance security with CIS Kubernetes V1.23 (#10304)

Benchmark item number 4.1.9

roles/kubernetes/node/tasks/kubelet.yml

@@ -12,7 +12,7 @@
     dest: "{{ kube_config_dir }}/kubelet.env"
     setype: "{{ (preinstall_selinux_state != 'disabled') | ternary('etc_t', omit) }}"
     backup: yes
-    mode: 0640
+    mode: 0600
   notify: Node | restart kubelet
   tags:
     - kubelet
@@ -22,7 +22,7 @@
   template:
     src: "kubelet-config.{{ kubeletConfig_api_version }}.yaml.j2"
     dest: "{{ kube_config_dir }}/kubelet-config.yaml"
-    mode: 0640
+    mode: 0600
   notify: Kubelet | restart kubelet
   tags:
     - kubelet