chore: update action node version to 20

Author: steven11329

.github/workflows/build-storybook-demo.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
-          node-version: '16'
+          node-version: '20'
       - uses: pnpm/action-setup@v4
         with:
           version: 9