build: bump @testing-library/jest-dom in /App/frontend

Bumps [@testing-library/jest-dom](https://github.com/testing-library/jest-dom) from 5.17.0 to 6.6.3.
- [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@v5.17.0...v6.6.3)

---
updated-dependencies:
- dependency-name: "@testing-library/jest-dom"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

App/frontend/package-lock.json

@@ -9,7 +9,7 @@
     "@fluentui/react": "^8.121.3",
     "@fluentui/react-components": "^9.56.3",
     "@fluentui/react-icons": "^2.0.266",
-    "@testing-library/jest-dom": "^5.17.0",
+    "@testing-library/jest-dom": "^6.6.3",
     "@testing-library/react": "^13.4.0",
     "@testing-library/user-event": "^13.5.0",
     "@types/d3": "^7.4.3",