Bump ruby/setup-ruby from 1 to 1.308.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1 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](ruby/setup-ruby@v1...v1.308.0)

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

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

Author: dependabot[bot]

.github/workflows/minitest.yml

@@ -42,7 +42,7 @@ jobs:
           path: vendor/publishing-api
 
       - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@v1.308.0
         with:
           bundler-cache: true