build: bump @testing-library/react in /App/frontend-app

Bumps [@testing-library/react](https://github.com/testing-library/react-testing-library) from 14.2.1 to 15.0.7.
- [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@v14.2.1...v15.0.7)

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

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

Author: dependabot[bot]

App/frontend-app/package-lock.json

@@ -51,7 +51,7 @@
     },
     "devDependencies": {
         "@testing-library/jest-dom": "^6.6.3",
-        "@testing-library/react": "^14.2.1",
+        "@testing-library/react": "^15.0.7",
         "@types/cors": "^2.8.13",
         "@types/express": "^4.17.17",
         "@types/jest": "^29.5.14",