[FEATURE] Ability to override version

[chubchubsancho]

Is your feature request related to a problem? Please describe

Since #684 we are unable to upgrade cluster-autoscaler and we are blocked on first release for cluster version

Describe the solution you'd like

I'd like to be able to upgrade my cluster-autoscaler addons by defining image.tag through:

cluster_autoscaler_helm_config = {
  values = [
    <<-EOT
    image:
      tag: v1.21.3
    EOT
  ]
}

Describe alternatives you've considered

Additional context

Add any other context or screenshots about the feature request here.