Bump ruby/setup-ruby from 1.190.0 to 1.191.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.190.0 to 1.191.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@a6e6f86...52753b7)

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

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

.github/workflows/docs.yml

@@ -38,7 +38,7 @@ jobs:
     - name: Git Checkout
       uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
     - name: Set up Ruby
-      uses: ruby/setup-ruby@a6e6f86333f0a2523ece813039b8b4be04560854
+      uses: ruby/setup-ruby@52753b7da854d5c07df37391a986c76ab4615999
       with:
         ruby-version: 2.7
         bundler-cache: true