chore(deps): update devdependency unbuild to v3

Author: renovate[bot]

package.json

@@ -45,7 +45,7 @@
     "listhen": "^1.7.2",
     "ofetch": "^1.3.4",
     "typescript": "^5.6.2",
-    "unbuild": "^2.0.0",
+    "unbuild": "^3.0.0",
     "vitest": "^1.6.0"
   },
   "packageManager": "pnpm@9.10.0"