Update npm-publish.yml

Author: srigar

.github/workflows/npm-publish.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: 12
+          node-version: 16
           registry-url: https://registry.npmjs.org/
       - run: npm ci
       - run: npm run build-tsdx