chore(deps-dev): bump @testing-library/user-event from 12.1.0 to 12.8.3

Bumps [@testing-library/user-event](https://github.com/testing-library/user-event) from 12.1.0 to 12.8.3.
- [Release notes](https://github.com/testing-library/user-event/releases)
- [Changelog](https://github.com/testing-library/user-event/blob/master/CHANGELOG.md)
- [Commits](testing-library/user-event@v12.1.0...v12.8.3)

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