Use the latest version of rubygems

Author: hsbt

.github/workflows/ci.yml

@@ -19,13 +19,14 @@ jobs:
         with:
           repository: rubygems/rubygems
           path: rubygems
-          ref: 3.6
+          ref: 3.7
           persist-credentials: false
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@0481980f17b760ef6bca5e8c55809102a0af1e5a # v1.263.0
         with:
           ruby-version: 3.4.6
+          rubygems: 3.7.2
           bundler-cache: true
           working-directory: guides