Add fail fast correclty

Author: patch0

.github/workflows/ruby.yml

@@ -18,7 +18,7 @@ jobs:
 
     runs-on: ubuntu-latest
     strategy:
-      fail_fast: false
+      fail-fast: false
       matrix:
         ruby-version: ['2.7', '3.1', '3.2']
         gemfile: [ rails_6.1, rails_7.0 ]