ci: Migrate to actions/setup-node@v2, test v16

Author: buffcode

.github/workflows/nodejs.yml

@@ -13,14 +13,15 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x, 15.x]
+        node-version: ['10', '12', '14', '16']
 
     steps:
       - 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 }}
+          check-latest: true
       - name: Cache Node.js modules
         id: yarn-cache
         uses: actions/cache@v2