try fix copilot-setup-steps.yml

Author: xiaoland

.github/workflows/copilot-setup-steps.yml

@@ -28,6 +28,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v5
 
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: latest
+
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with: