Update terraform-linters/setup-tflint action to v6

Author: renovate[bot]

.github/workflows/continuous-integration-tflint.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Clone repo
         uses: actions/checkout@v4
       - name: Setup TFLint
-        uses: terraform-linters/setup-tflint@v3
+        uses: terraform-linters/setup-tflint@v6
         with:
           tflint_version: v0.44.1
       - name: Run TFLint