Run tests in node 16

.github/workflows/nodejs.yml

@@ -15,10 +15,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
-    - name: Use Node.js 12.x
+    - name: Use Node.js 16.x
       uses: actions/setup-node@v1
       with:
-        node-version: 12.x
+        node-version: 16.x
     - name: npm install, build, and test
       run: |
         npm install