Bump ruby/setup-ruby

Bumps the actions-minor group with 1 update in the /.github/workflows directory: [ruby/setup-ruby](https://github.com/ruby/setup-ruby).


Updates `ruby/setup-ruby` from 1.267.0 to 1.268.0
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@d5126b9...8aeb6ff)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.268.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions-minor
...

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

Author: dependabot[bot]