Bump ruby/setup-ruby from 1.218.0 to 1.221.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.218.0 to 1.221.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@v1.218.0...32110d4)

---
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/publish-gem.yml

@@ -43,7 +43,7 @@ jobs:
           ruby -e 'print "version=", Gem::Specification.load(ARGV[0]).rubygems_version, "\n"' mime-types-data.gemspec >> $GITHUB_OUTPUT
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@d781c1b4ed31764801bfae177617bb0446f5ef8d #v1.218.0
+        uses: ruby/setup-ruby@32110d4e311bd8996b2a82bf2a43b714ccc91777 #v1.221.0
         with:
           bundler-cache: false
           ruby-version: ruby