Update hashicorp/setup-terraform action to v3 (#14)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

action.yml

@@ -58,7 +58,7 @@ runs:
           - ${{ inputs.atmos-gitops-config-path }}
 
     - name: Install Terraform
-      uses: hashicorp/setup-terraform@v2
+      uses: hashicorp/setup-terraform@v3
       with:
         terraform_version:  ${{ steps.config.outputs.terraform-version }}
         terraform_wrapper: false