build: sync pnpm version in ci.yml

Author: satnaing

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
       - name: "📦 Install pnpm"
         uses: pnpm/action-setup@v4
         with:
-          version: 10
+          version: 9.15.1
 
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4