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you should be able to cast it with `cluster.Kubeconfig.(pulumi.StringOutput)`

I tried and get this error:
invalid operation: cluster.Kubeconfig (variable of type pulumi.AnyOutput) is not an interface

Looks like this might be similar to this issue:
<https://github.com/pulumi/pulumi/issues/6073>

Here is my workaround:
`cluster.Kubeconfig.ApplyT(func(v interface{}) string {`
    `jsonBytes, _ := json.Marshal(v)`
    `return string(jsonBytes)`
`}).(pulumi.StringOutput)`