Update pr.yml

Author: ryantrem

.github/workflows/pr.yml

@@ -12,12 +12,6 @@ jobs:
         uses: actions/[email protected]
         with:
           submodules: 'recursive'
-      - name: Setup Node.js
-        uses: actions/[email protected]
-        with:
-          node-version: '12.x'
-          registry-url: 'https://registry.npmjs.org'
-          scope: '@babylonjs'
       - name: Setup Ninja
         run: brew install ninja
       - name: Yarn Install (Playground)