Use Ruby version 3.2.

Author: gkellogg

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.7
+        ruby-version: 3.2
     - name: Install dependencies
       run: bundle install