ci: update Node.js to v16 LTS version

Author: theoludwig

.github/workflows/nodejs.yml

@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x]
+        node-version: [10.x, 12.x, 14.x, 16.x]
 
     steps:
       - uses: 'actions/[email protected]'

.github/workflows/npm-publish.yml

@@ -14,7 +14,7 @@ jobs:
 
       - uses: 'actions/[email protected]'
         with:
-          node-version: 14
+          node-version: 16
           registry-url: 'https://registry.npmjs.org/'
 
       - run: 'npm ci'