chore: revert pnpm version update

We can't drop Node.js 14 until next major

Author: haoqunjiang

package.json

@@ -90,7 +90,7 @@
       "eslint --cache --fix"
     ]
   },
-  "packageManager": "pnpm@8.6.12",
+  "packageManager": "pnpm@7.33.6",
   "pnpm": {
     "overrides": {
       "@vitejs/plugin-vue": "workspace:*"