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During the upgrade process, `kubeadm` will take the current `ClusterConfiguration`, update the `KubernetesVersion` to the latest version, and call to `UploadConfiguration`. This change makes sure that when the mutation happens, not only the `ClusterStatus` is mutated, but the `ClusterConfiguration` object inside the `kubeadm-config` ConfigMap as well; it will contain the new `KubernetesVersion`.