Install RubyGems 3.5.23 for Ruby 3.0 and 3.1

Author: yahonda

.github/workflows/ruby.yml

@@ -24,7 +24,7 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby }}
       - name: Update RubyGems
-        run: gem update --system
+        run: gem update --system || gem update --system 3.5.23
       - name: Install dependencies
         run: bundle install --jobs 4 --retry 3
       - name: Run tests