chore(deps): update devdependency unbuild to v3

Author: renovate[bot]

package.json

@@ -65,7 +65,7 @@
     "prettier": "^3.4.2",
     "punycode.js": "^2.3.1",
     "typescript": "^5.7.2",
-    "unbuild": "^2.0.0",
+    "unbuild": "^3.1.0",
     "vite-tsconfig-paths": "^5.1.4",
     "vitest": "^2.1.8"
   },