use node 20 to build in github actions

Author: greggman

.github/workflows/deploy-to-gh-pages.yml

@@ -14,9 +14,9 @@ jobs:
           persist-credentials: false
 
       - name: Use Node.js 😂
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v4
         with:
-          node-version: '16.x'
+          node-version: '20.x'
 
       - name: Install and Build 🏭
         run: |