Update dependency ruby to v4

Author: renovate[bot]

.github/workflows/pages.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1.293.0
         with:
-          ruby-version: '3.4.9' # Not needed with a .ruby-version file
+          ruby-version: '4.0.2' # Not needed with a .ruby-version file
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
           cache-version: 0 # Increment this number if you need to re-download cached gems
       - name: Setup Pages