Bump opentofu/setup-opentofu from 1.0.6 to 1.0.8

Bumps [opentofu/setup-opentofu](https://github.com/opentofu/setup-opentofu) from 1.0.6 to 1.0.8.
- [Release notes](https://github.com/opentofu/setup-opentofu/releases)
- [Commits](opentofu/setup-opentofu@v1.0.6...v1.0.8)

---
updated-dependencies:
- dependency-name: opentofu/setup-opentofu
  dependency-version: 1.0.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/sumaform-validation.yml

@@ -27,7 +27,7 @@ jobs:
           terraform_wrapper: false
 
       - name: Install opentofu
-        uses: opentofu/setup-opentofu@v1.0.6
+        uses: opentofu/setup-opentofu@v1.0.8
         with:
           tofu_version: 1.10.7
       - name: Checkout sumaform