GH Actions: Bump ruby/setup-ruby in the action-runners group

Bumps the action-runners group with 1 update: [ruby/setup-ruby](https://github.com/ruby/setup-ruby).


Updates `ruby/setup-ruby` from 1.270.0 to 1.275.0
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@ac793fd...d354de1)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.275.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: action-runners
...

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

.github/workflows/update-website.yml

@@ -193,7 +193,7 @@ jobs:
 
       # Test that the site builds correctly.
       - name: Set up Ruby
-        uses: ruby/setup-ruby@ac793fdd38cc468a4dd57246fa9d0e868aba9085 # v1.270.0
+        uses: ruby/setup-ruby@d354de180d0c9e813cfddfcbdc079945d4be589b # v1.275.0
         with:
           # Use the version as per https://pages.github.com/versions/.
           ruby-version: 3.3.4