Use node v16.

Author: dompuiu

.github/workflows/npm-publish.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
         with:
-          node-version: '14.x'
+          node-version: '16.x'
           registry-url: https://registry.npmjs.org/
       - uses: actions/cache@v2
         id: npm-cache