ci: update npm cache

Author: alexcheng1982

.github/workflows/build.yml

@@ -20,6 +20,7 @@ jobs:
         with:
           node-version: 20.x
           cache: "npm"
+          cache-dependency-path: chat-agent-ui/package-lock.json
       - run: npm ci
         working-directory: ./chat-agent-ui
       - run: npm run build --if-present