revert node version

Author: nabeta

.github/workflows/rubyonrails.yml

@@ -33,9 +33,9 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
       - name: Setup node
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 16
       # Add or replace dependency steps here
       - name: Install Ruby and gems
         uses: ruby/setup-ruby@v1