chore: up tsdown

Author: posva

packages/router/package.json

@@ -147,7 +147,7 @@
     "rimraf": "^6.0.1",
     "rollup": "^3.29.5",
     "rollup-plugin-typescript2": "^0.36.0",
-    "tsdown": "^0.12.9",
+    "tsdown": "^0.15.7",
     "tsup": "^8.5.0",
     "vite": "^7.1.9",
     "vue": "~3.6.0-alpha.2"