Bump @testing-library/user-event from 11.2.0 to 12.0.6 in /ui

Bumps [@testing-library/user-event](https://github.com/testing-library/user-event) from 11.2.0 to 12.0.6.
- [Release notes](https://github.com/testing-library/user-event/releases)
- [Changelog](https://github.com/testing-library/user-event/blob/master/CHANGELOG.md)
- [Commits](https://github.com/testing-library/user-event/compare/v11.2.0...v12.0.6)

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

ui/package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "@testing-library/jest-dom": "^5.10.1",
     "@testing-library/react": "^10.3.0",
-    "@testing-library/user-event": "^11.4.2",
+    "@testing-library/user-event": "^12.0.6",
     "prettier": "^2.0.5"
   },
   "scripts": {