Fix CI

Author: rzane

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [3.0, 3.1, 3.2]
+        ruby: ['3.0', '3.1', '3.2']
         gemfile:
           - gemfiles/rails_6_1.gemfile
           - gemfiles/rails_7_0.gemfile