update node test runner to latest stable (#576)

Author: Adam Argyle

.github/workflows/test.yml

@@ -11,10 +11,10 @@ jobs:
     steps:
       - uses: actions/checkout@v1
 
-      - name: Use Node.js 10.x
+      - name: Use Node.js 16.x
         uses: actions/setup-node@v1
         with:
-          node-version: 10.x
+          node-version: 16.x
 
       - name: Test & Build
         run: |