chore: rollback vitest upgrade

vitest-dev/vitest#9065

Author: pi0

package.json

@@ -87,7 +87,7 @@
     "tslib": "^2.8.1",
     "typescript": "^5.9.3",
     "undici": "^7.16.0",
-    "vitest": "^4.0.10"
+    "vitest": "4.0.9"
   },
   "packageManager": "pnpm@10.22.0",
   "engines": {