Bump terraform-linters/setup-tflint from 4 to 6

Bumps [terraform-linters/setup-tflint](https://github.com/terraform-linters/setup-tflint) from 4 to 6.
- [Release notes](https://github.com/terraform-linters/setup-tflint/releases)
- [Commits](terraform-linters/setup-tflint@v4...v6)

---
updated-dependencies:
- dependency-name: terraform-linters/setup-tflint
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -27,7 +27,7 @@ jobs:
           terraform_version: 1.9.2
 
       - name: Tflint Setup
-        uses: terraform-linters/setup-tflint@v4
+        uses: terraform-linters/setup-tflint@v6
 
       - name: Terraform Docs Setup
         run: |