m/c/metroctl: automatically set up kubeconfig

When running takeownership this automatically sets up the necessary
kubeconfig configuration to make sure kubectl can access the cluster.

Change-Id: I135bfda2a13ea169a41506d3615d4e8a0bb0ea21
Reviewed-on: https://review.monogon.dev/c/monogon/+/818
Tested-by: Jenkins CI
Reviewed-by: Mateusz Zalega <mateusz@monogon.tech>
diff --git a/metropolis/cli/metroctl/k8scredplugin.go b/metropolis/cli/metroctl/k8scredplugin.go
index d2e591a..e434a61 100644
--- a/metropolis/cli/metroctl/k8scredplugin.go
+++ b/metropolis/cli/metroctl/k8scredplugin.go
@@ -9,7 +9,7 @@
 
 	"github.com/spf13/cobra"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	clientauthentication "k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
+	clientauthentication "k8s.io/client-go/pkg/apis/clientauthentication/v1"
 )
 
 var k8scredpluginCmd = &cobra.Command{