Update rails 5.2 setup

Author: MUTOgen

.github/workflows/ruby.yml

@@ -53,6 +53,10 @@ jobs:
       with:
         ruby-version: 3.2.2
         bundler-cache: true
+    - name: Update RubyGems
+      run: |
+        gem update --system 3.2.3
+        gem install bundler
     - name: Run tests
       run: bundle exec rake
     - run: gem uninstall -v '>= 2' -ax bundler || true