Fix CI: Update Node.js to v20 for HonKit build

Author: hemanth

.github/workflows/deploy-docs.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: 18
+          node-version: 20
 
       - name: Install Dependencies
         run: npm ci