Bump @testing-library/react from 12.0.0 to 12.1.0 in /ui (#1342)

Bumps [@testing-library/react](https://github.com/testing-library/react-testing-library) from 12.0.0 to 12.1.0.
- [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](https://github.com/testing-library/react-testing-library/compare/v12.0.0...v12.1.0)

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

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ui/package.json

@@ -38,7 +38,7 @@
   },
   "devDependencies": {
     "@testing-library/jest-dom": "^5.14.1",
-    "@testing-library/react": "^12.0.0",
+    "@testing-library/react": "^12.1.0",
     "@testing-library/react-hooks": "^7.0.2",
     "@testing-library/user-event": "^13.2.1",
     "css-mediaquery": "^0.1.2",