Bump react-icons from 5.1.0 to 5.2.1 in /ui

Bumps [react-icons](https://github.com/react-icons/react-icons) from 5.1.0 to 5.2.1.
- [Release notes](https://github.com/react-icons/react-icons/releases)
- [Commits](https://github.com/react-icons/react-icons/compare/v5.1.0...v5.2.1)

---
updated-dependencies:
- dependency-name: react-icons
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

ui/package.json

@@ -28,7 +28,7 @@
     "react-drag-listview": "^0.1.8",
     "react-ga": "^3.3.1",
     "react-hotkeys": "^2.0.0",
-    "react-icons": "^5.1.0",
+    "react-icons": "^5.2.1",
     "react-image-lightbox": "^5.1.4",
     "react-measure": "^2.5.2",
     "react-redux": "^7.2.9",