build(deps-dev): bump vitest from 3.0.9 to 3.1.1 in /web-frontend (#929)

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 3.0.9 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-version: 3.1.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

web-frontend/package-lock.json

@@ -38,7 +38,7 @@
     "sass": "^1.86.0",
     "typescript": "^5.8.2",
     "vite": "^6.2.2",
-    "vitest": "^3.0.9"
+    "vitest": "^3.1.1"
   },
   "overrides": {
     "eslint": {