chore(deps): bump ruby/setup-ruby in the dependencies group

Bumps the dependencies group with 1 update: [ruby/setup-ruby](https://github.com/ruby/setup-ruby).


Updates `ruby/setup-ruby` from 1.207.0 to 1.208.0
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@4a9ddd6...868b3f0)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Set up Git repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
       - name: Set up Ruby
-        uses: ruby/setup-ruby@4a9ddd6f338a97768b8006bf671dfbad383215f4 # v1
+        uses: ruby/setup-ruby@868b3f088412f139260f27f5b148179b9dd6b008 # v1
         with:
           bundler-cache: true
       - name: Set up Node