chore(deps-dev): Bump @testing-library/jest-dom in /frontend

Bumps [@testing-library/jest-dom](https://github.com/testing-library/jest-dom) from 6.6.3 to 6.8.0.
- [Release notes](https://github.com/testing-library/jest-dom/releases)
- [Changelog](https://github.com/testing-library/jest-dom/blob/main/CHANGELOG.md)
- [Commits](testing-library/jest-dom@v6.6.3...v6.8.0)

---
updated-dependencies:
- dependency-name: "@testing-library/jest-dom"
  dependency-version: 6.8.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -32,7 +32,7 @@
     "@eslint/js": "^9.25.0",
     "@playwright/test": "^1.48.2",
     "@tailwindcss/vite": "^4.1.13",
-    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/jest-dom": "^6.8.0",
     "@testing-library/react": "^16.3.0",
     "@types/node": "^24.0.0",
     "@types/react": "^19.1.2",