chore(deps): bump ruby/setup-ruby

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


Updates `ruby/setup-ruby` from 1.302.0 to 1.308.0
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](https://github.com/ruby/setup-ruby/compare/7372622e62b60b3cb750dcd2b9e32c247ffec26a...97ecb7b512899eb71ab1bf2310a624c6f1589ac6)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.306.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

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