Update api version for client authentication in kubeconfig

[prasad0896]

Issue #, if available: This commit updates the API Version from client.authentication.k8s.io/v1alpha1 to client.authentication.k8s.io/v1beta1 to address the issue #1020 . The corresponding binaries of aws-iam-authenticator have already been uploaded.

Description of changes: Simple change to update the api version as the older version was deprecated beginning kubernetes version 1.24

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Testing Done I created 1.22 AMI locally with the latest uploaded binaries and was able test nodegroup creation.

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