icp-deploy.tf referring to 2.3.6, not 3.1.1

Why does  icp-deply.tf refer to 2.3.6 of the terraform-module-icp-deploy and not 3.1.1?

In its current state it says:

```
module "icpprovision" {
    source = "github.com/ibm-cloud-architecture/terraform-module-icp-deploy.git?ref=2.3.6"
```