fix pnpm versioning in ci

Author: Kylejeong2

.github/workflows/ci.yml

@@ -13,8 +13,6 @@ jobs:
     - uses: actions/checkout@v4
     - name: Install pnpm
       uses: pnpm/action-setup@v4
-      with:
-        version: 8
     - name: Use Node.js 22
       uses: actions/setup-node@v4
       with: