refactor: use tf wrapper after std out fix

[mcwarman]

#41 updated setup-terraform which included a fix to the terraform wrapper, which returns std out correctly.

This means we don't need to use the binary directly.

[github-actions]

Terraform Plan

Terraform Format and Style ✏️ success

Terraform Initialization ⚙️ success

Terraform Validation 📋 success

Terraform Plan 📖 success

Show Plan

random_pet.name: Refreshing state... [id=comic lemur]

Terraform used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
-/+ destroy and then create replacement

Terraform will perform the following actions:

  # random_pet.name is tainted, so must be replaced
-/+ resource "random_pet" "name" {
      ~ id        = "comic lemur" -> (known after apply)
        # (2 unchanged attributes hidden)
    }

Plan: 1 to add, 0 to change, 1 to destroy.

Changes to Outputs:
  ~ message = "Hello Comic Lemur!" -> (known after apply)

─────────────────────────────────────────────────────────────────────────────

Saved the plan to: tfplan

To perform exactly these actions, run the following command to apply:
    terraform apply "tfplan"