fix: use pnpm in github workflow

Author: softbeehive

.github/workflows/ci.yml

@@ -16,6 +16,11 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
 
       - name: Use Node.js
         uses: actions/setup-node@v4