chore(deps): update devdependency unbuild to v3

Author: renovate[bot]

package.json

@@ -64,7 +64,7 @@
     "memory-fs": "^0.5.0",
     "prettier": "^3.5.3",
     "typescript": "^5.8.2",
-    "unbuild": "^2.0.0",
+    "unbuild": "^3.6.1",
     "vitest": "^2.1.9",
     "webpack": "^5.98.0",
     "webpack-cli": "^5.1.4",