Replace actions/setup-ruby with replacement ruby/setup-ruby

Author: Firefishy

.github/workflows/build_arm.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Setup Ruby
-      uses: actions/setup-ruby@v1
+      uses: ruby/setup-ruby@v1
       with:
         ruby-version: '2.7'