Test on one less Ruby version

Author: jmettraux

Diff for: .github/workflows/test.yaml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         os: [ ubuntu-latest ]
         ruby: [
-          '3.1', '3.2', '3.3', '3.4',
+          '3.1', '3.3', '3.4',
           'jruby-9.4',
           'truffleruby-22.3' ]
         experimental: [ false ]