Update deployment workflow to specify Node.js version and use pnpm as package manager

Author: yedidyar-ni

.github/workflows/deploy.yml

@@ -22,6 +22,10 @@ jobs:
         uses: actions/checkout@v4
       - name: Install, build, and upload your site
         uses: withastro/action@v3
+        with:
+          path: .
+          node-version: 20
+          package-manager: pnpm@latest
 
   deploy:
     needs: build