Bump @reduxjs/toolkit from 1.5.1 to 1.6.0 in /ui

Bumps [@reduxjs/toolkit](https://github.com/reduxjs/redux-toolkit) from 1.5.1 to 1.6.0.
- [Release notes](https://github.com/reduxjs/redux-toolkit/releases)
- [Commits](https://github.com/reduxjs/redux-toolkit/compare/v1.5.1...v1.6.0)

---
updated-dependencies:
- dependency-name: "@reduxjs/toolkit"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

ui/package.json

@@ -6,7 +6,7 @@
     "@material-ui/core": "4.11.3",
     "@material-ui/icons": "4.11.2",
     "@material-ui/lab": "4.0.0-alpha.57",
-    "@reduxjs/toolkit": "1.5.1",
+    "@reduxjs/toolkit": "1.6.0",
     "@testing-library/jest-dom": "^5.12.0",
     "@testing-library/react": "^11.2.6",
     "@testing-library/user-event": "^13.1.9",