build(deps): bump ruby/setup-ruby from 1.238.0 to 1.239.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.238.0 to 1.239.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](e34163cd15...84684c07c1)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.239.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/docs.yml

@@ -52,7 +52,7 @@ jobs:
         run: vale docs/
 
       - name: Install Ruby
-        uses: ruby/setup-ruby@e34163cd15f4bb403dcd72d98e295997e6a55798 # v1.238.0
+        uses: ruby/setup-ruby@84684c07c1965536eb4802c8daf1a77968df0cb1 # v1.239.0
         with:
           bundler-cache: true
           working-directory: docs

.github/workflows/rubydoc.yml

@@ -42,7 +42,7 @@ jobs:
           persist-credentials: false
 
       - name: Install Ruby
-        uses: ruby/setup-ruby@e34163cd15f4bb403dcd72d98e295997e6a55798 # v1.238.0
+        uses: ruby/setup-ruby@84684c07c1965536eb4802c8daf1a77968df0cb1 # v1.239.0
         with:
           bundler-cache: true
           working-directory: rubydoc