fix: replace actions/setup-ruby with ruby/setup-ruby (#188)

Co-authored-by: Johnny Almonte <johnny243@users.noreply.github.com>

Author: johnny243

.github/workflows/dev.yml

@@ -26,7 +26,7 @@ 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