chore(deps): update hashicorp/setup-terraform action to v4

Author: renovate[bot]

.github/workflows/terraform_test.yaml

@@ -35,7 +35,7 @@ jobs:
         uses: actions/checkout@v6.0.2
 
       - name: Setup Terraform
-        uses: hashicorp/setup-terraform@v3.1.2
+        uses: hashicorp/setup-terraform@v4.0.0
 
       - name: Run terraform fmt
         run: terraform fmt -check -recursive
@@ -112,7 +112,7 @@ jobs:
             echo EOF
           } >> "$GITHUB_ENV"
       - run: juju add-model test-deploy-image-builder
-      - uses: hashicorp/setup-terraform@v3.1.2
+      - uses: hashicorp/setup-terraform@v4.0.0
       - run: terraform init
         working-directory: ${{env.WORKING_DIR}}
       - run: terraform validate