chore(deps): bump hashicorp/setup-terraform from 2.0.3 to 3.1.2

Bumps [hashicorp/setup-terraform](https://github.com/hashicorp/setup-terraform) from 2.0.3 to 3.1.2.
- [Release notes](https://github.com/hashicorp/setup-terraform/releases)
- [Changelog](https://github.com/hashicorp/setup-terraform/blob/main/CHANGELOG.md)
- [Commits](hashicorp/setup-terraform@v2.0.3...v3.1.2)

---
updated-dependencies:
- dependency-name: hashicorp/setup-terraform
  dependency-version: 3.1.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/certification.yml

@@ -198,7 +198,7 @@ jobs:
         done
 
     - name: Setup Terraform
-      uses: hashicorp/setup-terraform@v2.0.3
+      uses: hashicorp/setup-terraform@v3.1.2
       if: matrix.require-terraform == 'true'
 
     - name: Set Cloudflare env vars

.github/workflows/conformance.yml

@@ -204,7 +204,7 @@ jobs:
 
     - name: Setup Terraform
       if: matrix.require-terraform == 'true'
-      uses: hashicorp/setup-terraform@v2.0.3
+      uses: hashicorp/setup-terraform@v3.1.2
 
     - name: Set Cloudflare env vars
       if: matrix.require-cloudflare-credentials == 'true'