chore: bump pnpm to latest v9 (#705)

Author: userquin

package.json

@@ -2,7 +2,7 @@
   "name": "vite-plugin-pwa",
   "type": "module",
   "version": "0.19.8",
-  "packageManager": "pnpm@8.15.6",
+  "packageManager": "pnpm@9.0.6",
   "description": "Zero-config PWA for Vite",
   "author": "antfu <[email protected]>",
   "license": "MIT",