chore(deps): update devdependency unbuild to ^3.1.0

Author: renovate[bot]

package.json

@@ -40,7 +40,7 @@
     "changelogen": "^0.5.7",
     "eslint": "^9.17.0",
     "typescript": "^5.7.2",
-    "unbuild": "^3.0.1",
+    "unbuild": "^3.1.0",
     "vite": "^6.0.6",
     "vitest": "2.1.8",
     "vue": "3.5.13",