chore(deps): update pnpm to v8.15.6

Author: renovate[bot]

package.json

@@ -8,7 +8,7 @@
     "require": "./dist/index.js",
     "default": "./dist/index-esm.mjs"
   },
-  "packageManager": "pnpm@8.14.0",
+  "packageManager": "pnpm@8.15.6",
   "engines": {
     "node": ">=20"
   },