chore(deps): update dependency ruby to v4

Author: renovate[bot]

.github/workflows/jekyll.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4.7
+          ruby-version: 4.0.1
           bundler-cache: true
       - run: bundle config set --global path "$(pwd)/vendor/bundle"
       - run: bundle install --no-color