chore(deps): update pnpm to v8.15.4

Author: renovate[bot]

package.json

@@ -2,7 +2,7 @@
   "name": "vitesse-uni-app",
   "version": "0.0.0",
   "private": true,
-  "packageManager": "pnpm@8.14.1",
+  "packageManager": "pnpm@8.15.4",
   "license": "MIT",
   "scripts": {
     "dev": "uni",