build(deps): bump terraform-linters/setup-tflint from 5 to 6 (#185)

Bumps [terraform-linters/setup-tflint](https://github.com/terraform-linters/setup-tflint) from 5 to 6.
- [Release notes](https://github.com/terraform-linters/setup-tflint/releases)
- [Commits](terraform-linters/setup-tflint@v5...v6)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/pr-validation.yaml

@@ -57,7 +57,7 @@ jobs:
       uses: hashicorp/setup-terraform@v3.1.2
 
     - name: Setup TFLint
-      uses: terraform-linters/setup-tflint@v5
+      uses: terraform-linters/setup-tflint@v6
 
     - name: Terraform Format
       id: fmt