ci: upgrade Ruby 3.4, tooling and dependencies

Author: MikkCZ

.github/workflows/build.yml

@@ -23,7 +23,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gems-
       - name: Build site
-        run: make all_in_container
+        run: make all
       - name: Save built site for deploy
         uses: actions/upload-pages-artifact@v5
         with: