Fix CI workflow Node.js version: update from 18 to 20

Co-authored-by: rajbos <6085745+rajbos@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: "18"
+          node-version: "20"
           cache: 'npm'
 
       - name: Install dependencies