build: bump vitest from 3.0.7 to 3.1.1 in /code/frontend

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 3.0.7 to 3.1.1.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v3.1.1/packages/vitest)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

code/frontend/package-lock.json

@@ -53,6 +53,6 @@
         "ts-node": "^10.9.2",
         "typescript": "^5.7.3",
         "vite": "^6.0.11",
-        "vitest": "^3.0.4"
+        "vitest": "^3.1.1"
     }
 }