Use builtin cache logic in setup-node action for GitHub Actions

.github/workflows/node.yml

@@ -31,22 +31,10 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
-
-      - name: Get npm cache directory
-        id: npm-cache
-        run: |
-          echo "::set-output name=dir::$(npm config get cache)"
-
-      - name: Cache npm dependencies
-        uses: actions/cache@v2
-        with:
-          path: ${{ steps.npm-cache.outputs.dir }}
-          key: ${{ matrix.os }}-node-${{ matrix.node-version }}-${{ hashFiles('**/package.json') }}
-          restore-keys: |
-            ${{ matrix.os }}-node-${{ matrix.node-version }}-
+          cache: npm
 
       - name: Install npm dependencies
         run: npm install