remove pnpm version

Author: Kylejeong2

.github/workflows/ci.yml

@@ -17,8 +17,6 @@ jobs:
 
       - name: Install pnpm
         uses: pnpm/action-setup@v4
-        with:
-          version: 8
 
       - name: Setup Node.js
         uses: actions/setup-node@v4