chore(deps): update devdependency unbuild to v3

Author: renovate[bot]

package.json

@@ -85,7 +85,7 @@
     "prettier": "^3.2.5",
     "prettier-plugin-jsdoc": "^1.3.0",
     "typescript": "^5.3.3",
-    "unbuild": "^2.0.0",
+    "unbuild": "^3.4.2",
     "vitepress": "1.0.0-rc.44",
     "vitest": "^2.1.2",
     "vue": "^3.4.19"