Update Kubernetes version to 1.21.4

README.md

@@ -130,7 +130,7 @@ Note: Upstart/SysV init based OS types are not supported.
 ## Supported Components
 
 - Core
-  - [kubernetes](https://github.com/kubernetes/kubernetes) v1.21.3
+  - [kubernetes](https://github.com/kubernetes/kubernetes) v1.21.4
   - [etcd](https://github.com/coreos/etcd) v3.4.13
   - [docker](https://www.docker.com/) v20.10 (see note)
   - [containerd](https://containerd.io/) v1.4.6

inventory/sample/group_vars/k8s_cluster/k8s-cluster.yml

@@ -17,7 +17,7 @@ kube_token_dir: "{{ kube_config_dir }}/tokens"
 kube_api_anonymous_auth: true
 
 ## Change this to use another Kubernetes version, e.g. a current beta release
-kube_version: v1.21.3
+kube_version: v1.21.4
 
 # Where the binaries will be downloaded.
 # Note: ensure that you've enough disk space (about 1G)