chore(deps): update pnpm to v9.15.8

Author: renovate[bot]

package.json

@@ -10,7 +10,7 @@
   ],
   "funding": "https://github.com/sponsors/ota-meshi",
   "license": "MIT",
-  "packageManager": "[email protected].7",
+  "packageManager": "[email protected].8",
   "engines": {
     "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
   },