[1.6] RKE v1.6.4 support

[jiaqiluo]

This issue is used to track the effort for supporting RKE v1.6.4 https://github.com/rancher/rke/releases/tag/v1.6.4

[jiaqiluo]

This issue can be validated on v1.6.1-rc1

[markusewalker]

Validated that this is addressed. See details below:

ENVIRONMENT DETAILS

• TFP-RKE version: v1.6.1-rc1
• RKE version: v1.30.6

TEST RESULT

#	Scenario	Result
1	Provision RKE1 cluster using TFP-RKE v1.6.1-rc1	✅

VALIDATION STEPS

Scenario 1

1. On client node, utilize the following main.tf:

terraform {
  required_providers {
    rke = {
      source  = "terraform.local/local/rke"
      version = "1.6.1-rc1"
    }
  }
}

provider "rke" {
  log_file = var.log_file
}

resource "rke_cluster" "cluster" {
  nodes {
    address = var.address1
    user    = var.user
    role    = ["controlplane", "worker", "etcd"]
    ssh_key = file(var.ssh_key_path)
  }
  nodes {
    address = var.address2
    user    = var.user
    role    = ["controlplane", "worker", "etcd"]
    ssh_key = file(var.ssh_key_path)
  }
  nodes {
    address = var.address3
    user    = var.user
    role    = ["controlplane", "worker", "etcd"]
    ssh_key = file(var.ssh_key_path)
  }
  enable_cri_dockerd = true
}

NOTE: The kubeconfig is in outputs.tf and will not be shared here.
2. Run terraform apply.
3. Using the kubeconfig defined in outputs.tf, place that in ~/HOME/.kube/config.
4. Run kubectl get nodes:

$ kubectl get nodes
NAME            STATUS   ROLES                      AGE   VERSION
<omitted>   Ready    controlplane,etcd,worker   84s   v1.30.6
<omitted>   Ready    controlplane,etcd,worker   84s   v1.30.6
<omitted>   Ready    controlplane,etcd,worker   84s   v1.30.6