Fix step description in cruby-bindings workflow

Author: eregon

.github/workflows/cruby-bindings.yml

@@ -25,7 +25,7 @@ jobs:
 
     runs-on: ubuntu-24.04
     steps:
-      - name: Set up latest ruby head
+      - name: Set up base ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ruby