ci: fix setup ruby

Author: daianaszwimer

.github/workflows/prod.yml

@@ -24,7 +24,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby
-      uses: actions/setup-ruby@v1
+      uses: ruby/setup-ruby@v1
       with:
         ruby-version: 2.6
     - uses: actions/cache@v2