Update pages-gem.yml

Author: tsusdere

.github/workflows/pages-gem.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@354a1ad156761f5ee2b7b13fa8e09943a5e8d252 # v1.229.0
         with:
-          ruby-version: '3.2'
+          ruby-version: '3.3'
       - name: Build gem
         run: |
           gem build github-pages-health-check.gemspec