chore(deps): update pnpm to v8

Author: renovate[bot]

package.json

@@ -10,7 +10,7 @@
   ],
   "funding": "https://github.com/sponsors/ota-meshi",
   "license": "MIT",
-  "packageManager": "pnpm@7.33.2",
+  "packageManager": "pnpm@8.6.4",
   "engines": {
     "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
   },