ci: try v2 and cached github actions

Author: Scrum

.github/workflows/nodejs.yml

@@ -23,9 +23,10 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Set Node.js version
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
+          cache: npm
 
       - name: Install npm dependencies
         run: npm ci