Update github actions workflow for ruby 3.0

Author: mmena1

.github/workflows/rails.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        ruby: [ '2.6' ]
+        ruby: [ '3.0' ]
 
     steps:
       - name: Checkout code
@@ -46,7 +46,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v1
         with:
-          node-version: 12.13.1
+          node-version: 14.15.4
       - name: Find yarn cache location
         id: yarn-cache
         run: echo "::set-output name=dir::$(yarn cache dir)"