[pkg/token]: Update credential API version

[micahhausler]

Kubernetes has deprecated v1alpha1, v1beta1 has been available since Kubernetes
v1.11 (kubernetes/kubernetes#64482). At the time of this commit,
community-supported versions are v1.19, v1.20, v1.21. This change will break
for Kubernetes clients using client-go or kubectl v1.10 and earlier, which
reached end-of-life community support on Feb 13, 2019. EKS ended support
for 1.10 in September of 2019.

Kubernetes 1.22 will introduce v1 of this API, but v1beta1 will likely be
supported for a period of 2 more years.

Signed-off-by: Micah Hausler [email protected]

[PatrickXYS]

Thank you for taking care of this @micahhausler

[nckturner]

/lgtm
/approve

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[timfallmk]

Might be important to make a note about changing kubeconfigs to reflect the version change. If they don't they may get the following error and not know where to go.

Unable to connect to the server: getting credentials: exec plugin is configured to use API version client.authentication.k8s.io/v1alpha1, plugin returned version client.authentication.k8s.io/v1beta1

[carl-reverb]

sed -i .bak -e 's/v1alpha1/v1beta1/' ~/.kube/config

[timfallmk]

@carl-reverb That's helpful for people that land here from google. Perhaps a quick NB on the README or release notes?

[christinax32]

@carl-reverb @timfallmk I am still getting this kubectl error after running "sed -i .bak -e 's/v1alpha1/v1beta1/' ~/.kube/config"

Unable to connect to the server: getting credentials: exec plugin is configured to use API version client.authentication.k8s.io/v1alpha1, plugin returned version client.authentication.k8s.io/v1beta1

I am using Warning: kubernetes-cli 1.23.5 already installed and aws-iam-authenticator 0.5.5

[timfallmk]

@christinax32 The only thing I can think of would be a mistype. I solved this problem by removing aws-iam-authenticator completely in favor of aws eks get-token