Fix our asset deploy workflow

.github/workflows/push-asset-readme-update.yml

@@ -1,22 +1,29 @@
 name: Plugin asset/readme update
+
 on:
   push:
     branches:
       - trunk
+
 jobs:
   trunk:
     name: Push to trunk
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - name: Install node
-        uses: actions/setup-node@v1
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup node version
+        uses: actions/setup-node@v4
         with:
-          node-version: 12
+          node-version: 16
+          cache: npm
+
       - name: Build
         run: |
           npm install
           npm run build
+
       - name: WordPress.org plugin asset/readme update
         uses: 10up/action-wordpress-plugin-asset-update@stable
         env: