Use NodeJs v16 for tests

So 14 worked, let's try 16. (Actually noticed fedora uses v16 not 14 which makes sense if you see the support time.)

.github/workflows/tests.yml

@@ -104,7 +104,7 @@ jobs:
     - name: Setup Node
       uses: actions/setup-node@v3
       with:
-        node-version: '14'
+        node-version: '16'
         cache: 'npm'
         cache-dependency-path: 'js/package-lock.json'