use node 16 on github actions

Author: greggman

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

@@ -16,7 +16,7 @@ jobs:
       - name: Use Node.js 😂
         uses: actions/setup-node@v1
         with:
-          node-version: '14.x'
+          node-version: '16.x'
 
       - name: Install and Build 🏭
         run: |