chore: Update hashicorp/setup-terraform action to v4

Author: renovate[bot]

.github/workflows/acc-tests.yml

@@ -43,7 +43,7 @@ jobs:
           cache: false
       # If we don't pre-install Terraform, the parallel acceptance tests might fail.
       # See https://github.com/hashicorp/terraform-plugin-testing/issues/429.
-      - uses: hashicorp/setup-terraform@v3
+      - uses: hashicorp/setup-terraform@v4
         with:
           terraform_wrapper: false
       - name: Run acceptance tests