Bump hashicorp/setup-terraform from 2 to 3 (aws-observability#975)

Bumps [hashicorp/setup-terraform](https://github.com/hashicorp/setup-terraform) from 2 to 3.
- [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...v3)

---
updated-dependencies:
- dependency-name: hashicorp/setup-terraform
  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/ci-terraform.yml

@@ -19,5 +19,5 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: hashicorp/setup-terraform@v2
+      - uses: hashicorp/setup-terraform@v3
       - run: terraform fmt -check -recursive