Bump ruby/setup-ruby from 1.299.0 to 1.308.0 (#4799)

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.299.0 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/3ff19f5e2baf30647122352b96108b1fbe250c64...97ecb7b512899eb71ab1bf2310a624c6f1589ac6)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.308.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Junegunn Choi <junegunn.c@gmail.com>