Downgrade ruby slightly

According to https://talk.jekyllrb.com/t/unable-to-install-jekyll-on-m3-macbook/8836/4 there's a conflict between Ruby 3.3 and github-pages.  3.2.3 doesn't have the problem

.github/workflows/jekyll.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.3' # Not needed with a .ruby-version file
+          ruby-version: '3.2.3' # 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