Use ruby/setup-ruby

Author: nobu

.github/workflows/windows.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
     - uses: actions/checkout@master
     - name: Set up Ruby
-      uses: actions/setup-ruby@v1
+      uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}
     - name: Set up Bundler