Update deploy_docsy.yml

make use of npm 20

.github/workflows/deploy_docsy.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v3
         with:
-          node-version: '18'
+          node-version: '20'
           cache: 'npm'
           # The action defaults to search for the dependency file (package-lock.json,
           # npm-shrinkwrap.json or yarn.lock) in the repository root, and uses its