Bump @testing-library/jest-dom from 6.4.7 to 6.4.8 in /my-app

Bumps [@testing-library/jest-dom](https://github.com/testing-library/jest-dom) from 6.4.7 to 6.4.8.
- [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@v6.4.7...v6.4.8)

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

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