actions: Update Ruby version to 3.4

Author: gonX

.github/workflows/jekyll-build-workflow.yml

@@ -19,7 +19,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           working-directory: "site/"
-          ruby-version: '3.2' # Not needed with a .ruby-version file
+          ruby-version: '3.4' # Not needed with a .ruby-version file
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
 
       - name: Build site

.github/workflows/jekyll.yml

@@ -46,7 +46,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.0' # Not needed with a .ruby-version file
+          ruby-version: '3.4' # Not needed with a .ruby-version file
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
 
       - name: Check final HTML with html-proofer