Bump ruby/setup-ruby from 1.319.0 to 1.321.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.319.0 to 1.321.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@003a5c4...95ef2b0)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.321.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -33,7 +33,7 @@ jobs:
         node-version: "20.x"
 
     - name: "Install Ruby ${{ matrix.ruby }}"
-      uses: "ruby/setup-ruby@003a5c4d8d6321bd302e38f6f0ec593f77f06600" # v1.319.0
+      uses: "ruby/setup-ruby@95ef2b042f9d7a56d8268cba8559e2842e2ad01b" # v1.321.0
       with:
         ruby-version: "${{ matrix.ruby }}"
         bundler-cache: true