SKE cluster outdated error message

[robinschneider]

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When creating a SKE cluster with terraform, I get the following warning:

╷
│ Warning: The kubelogin field is set to null
│ 
│   with stackit_ske_cluster.example,
│   on main.tf line 15, in resource "stackit_ske_cluster" "example":
│   15: resource "stackit_ske_cluster" "example" {
│ 
│ Failed to get static token kubeconfig, which means the new credentials rotation flow might already been triggered for this cluster. If you are already using the stackit_ske_kubeconfig resource you can ignore this warning. If not, you must use it to access this cluster's short-lived admin kubeconfig.
╵

The static token kubeconfig was only supported until Kubernetes v1.26 which is not available anymore, so this warning is not relevant anymore and should be removed.