build(deps): bump terraform-linters/setup-tflint from 3 to 6

Bumps [terraform-linters/setup-tflint](https://github.com/terraform-linters/setup-tflint) from 3 to 6.
- [Release notes](https://github.com/terraform-linters/setup-tflint/releases)
- [Commits](terraform-linters/setup-tflint@v3...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] <support@github.com>

Author: dependabot[bot]

.github/workflows/tflint.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v4
         name: Checkout source code
 
-      - uses: terraform-linters/setup-tflint@v3
+      - uses: terraform-linters/setup-tflint@v6
         name: Setup TFLint
 
       - name: Run TFLint