Update dependency vitest to v2.1.9 [SECURITY]

Author: renovate[bot]

package.json

@@ -53,6 +53,6 @@
     "supertest": "7.0.0",
     "typescript": "5.8.2",
     "typescript-eslint": "8.26.0",
-    "vitest": "2.1.8"
+    "vitest": "2.1.9"
   }
 }