Bump ruby/setup-ruby from 1.157.0 to 1.159.0 (#1592)

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.157.0 to 1.159.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Commits](ruby/setup-ruby@a05e473...54a18e2)

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

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

.github/workflows/exercise-tests.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@a05e47355e80e57b9a67566a813648fa67d92011
+        uses: ruby/setup-ruby@54a18e26dbbb1eabc604f317ade9a5788dddef81
         with:
           ruby-version: ${{ matrix.ruby-version }}
           bundler-cache: true