Bump vitest from 2.1.4 to 2.1.9 in /frontend

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 2.1.4 to 2.1.9.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.9/packages/vitest)

---
updated-dependencies:
- dependency-name: vitest
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

frontend/packages/api/package.json

@@ -45,7 +45,7 @@
     "ts-node": "^10.9.1",
     "tslib": "^2.4.0",
     "typescript": "^4.9.5",
-    "vitest": "^2.1.4",
+    "vitest": "^2.1.9",
     "whatwg-fetch": "^3.6.2"
   },
   "type": "module",