ci: pin pnpm 9 for CI

Author: simonguo

.github/workflows/nodejs-ci.yml

@@ -21,6 +21,7 @@ jobs:
       - name: Enable Corepack (PNPM from packageManager)
         run: |
           corepack enable
+          corepack prepare [email protected] --activate
 
       - name: Setup Node
         uses: actions/setup-node@v4