build(deps-dev): bump @vitest/coverage-v8 in /frontend (GreedyBear-Project#1332)

Bumps [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8) from 4.1.5 to 4.1.6.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.6/packages/coverage-v8)

---
updated-dependencies:
- dependency-name: "@vitest/coverage-v8"
  dependency-version: 4.1.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

frontend/package-lock.json

@@ -50,7 +50,7 @@
     "@testing-library/react": "^16.3.2",
     "@testing-library/user-event": "^14.6.1",
     "@vitejs/plugin-react": "^6.0.1",
-    "@vitest/coverage-v8": "^4.1.5",
+    "@vitest/coverage-v8": "^4.1.6",
     "eslint": "^9.36.0",
     "jsdom": "^29.1.1",
     "prettier": "^3.8.3",