chore(deps): update dependency vitest to v4 (#250)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -30,7 +30,7 @@
     "oust": "^2.0.4",
     "prettier": "^3.6.2",
     "vitepress": "1.6.4",
-    "vitest": "^3.2.4",
+    "vitest": "^4.0.2",
     "walk-sync": "^4.0.1"
   }
 }