Bump vitest from 2.1.4 to 2.1.5 in /app-frontend

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 2.1.4 to 2.1.5.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.5/packages/vitest)

---
updated-dependencies:
- dependency-name: vitest
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

app-frontend/package.json

@@ -18,7 +18,7 @@
     "@types/react": "^18.3.12",
     "@types/react-dom": "^18.3.1",
     "jsdom": "^25.0.1",
-    "vitest": "^2.1.4",
+    "vitest": "^2.1.5",
     "typescript": "^5.6.3"
   },
   "scripts": {