Update deploy.yml

Updated to node-version 20, from node-version 18.

Author: ThomasJButler

.github/workflows/deploy.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: '18'
+          node-version: '20'
           cache: 'npm'
 
       - name: Install dependencies