Rails main now requires ruby 3.2

Author: elia

.github/workflows/ci.yml

@@ -13,6 +13,8 @@ jobs:
             rails: 'main'
           - ruby: '3.0'
             rails: 'main'
+          - ruby: '3.1'
+            rails: 'main'
 
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/rails_${{ matrix.rails }}.gemfile