chore(deps): update devdependency unbuild to v3

Author: renovate[bot]

package.json

@@ -43,7 +43,7 @@
     "prettier": "^3.2.5",
     "scule": "^1.3.0",
     "typescript": "^5.4.5",
-    "unbuild": "^2.0.0",
+    "unbuild": "^3.1.0",
     "vitest": "^1.5.2"
   },
   "packageManager": "pnpm@9.0.6"