chore(deps): update pnpm to v8.15.4

Author: renovate[bot]

package.json

@@ -13,7 +13,7 @@
   "bugs": {
     "url": "https://github.com/ShaggyTech/nhtsa-api-wrapper/issues"
   },
-  "packageManager": "pnpm@8.9.2",
+  "packageManager": "pnpm@8.15.4",
   "workspaces": [
     "apps/*",
     "config/*",