build(deps): bump @testing-library/user-event in /web

Bumps [@testing-library/user-event](https://github.com/testing-library/user-event) from 12.8.1 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](https://github.com/testing-library/user-event/compare/v12.8.1...v12.8.3)

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

web/package.json

@@ -5,7 +5,7 @@
   "dependencies": {
     "@testing-library/jest-dom": "^5.11.9",
     "@testing-library/react": "^11.2.5",
-    "@testing-library/user-event": "^12.8.1",
+    "@testing-library/user-event": "^12.8.3",
     "@types/jest": "^26.0.20",
     "@types/node": "^14.14.32",
     "@types/react": "^17.0.3",