Bump ruby/setup-ruby from 1.186.0 to 1.187.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.186.0 to 1.187.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@2a9a743...161cd54)

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

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

.github/workflows/docs.yml

@@ -38,7 +38,7 @@ jobs:
     - name: Git Checkout
       uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
     - name: Set up Ruby
-      uses: ruby/setup-ruby@2a9a743e19810b9f3c38060637daf594dbd7b37f
+      uses: ruby/setup-ruby@161cd54b698f1fb3ea539faab2e036d409550e3c
       with:
         ruby-version: 2.7
         bundler-cache: true