Pinning kubectl version to 1.23.6 to avoid aws-cli user apiVersion issue

[barankyle]

Summary

kubectl v1.24 removed support for apiVersion client.authentication.k8s.io/v1alpha1. aws-cli is
current hard-coded to use that version, though. Pinning installation of kubectl to 1.23 until
aws-cli is updated to use v1beta1 or v1.

References

closes #insert number here

Checklist

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