Update node

We need support for global crypto, which was added in node 19

.github/workflows/nodejs.yml

@@ -11,10 +11,10 @@ jobs:
         uses: actions/checkout@v3
         with:
           submodules: recursive
-      - name: Use Node.js 16.x
+      - name: Use Node.js 20.x
         uses: actions/setup-node@v3
         with:
-          node-version: 16.x
+          node-version: 20.x
       - name: Install testing dependencies
         run: npm ci
       - name: Test all apps and widgets