build(deps-dev): bump @testing-library/react in /frontend

Bumps [@testing-library/react](https://github.com/testing-library/react-testing-library) from 14.2.2 to 15.0.5.
- [Release notes](https://github.com/testing-library/react-testing-library/releases)
- [Changelog](https://github.com/testing-library/react-testing-library/blob/main/CHANGELOG.md)
- [Commits](testing-library/react-testing-library@v14.2.2...v15.0.5)

---
updated-dependencies:
- dependency-name: "@testing-library/react"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

frontend/package.json

@@ -55,7 +55,7 @@
     "@storybook/react-vite": "^8.0.9",
     "@tanstack/router-devtools": "^1.31.3",
     "@tanstack/router-vite-plugin": "^1.30.0",
-    "@testing-library/react": "^14.2.2",
+    "@testing-library/react": "^15.0.5",
     "@types/node": "^20.12.7",
     "@types/react": "^18.3.1",
     "@types/react-dom": "^18.3.0",