set pnpm to v9

Author: gitteri

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Setup pnpm
         uses: pnpm/action-setup@v2
         with:
-          version: 8
+          version: 9
 
       - name: Setup Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4