Bump react-countup from 6.4.1 to 6.4.2 in /ui (#2970)

Bumps [react-countup](https://github.com/glennreyes/react-countup) from 6.4.1 to 6.4.2.
- [Release notes](https://github.com/glennreyes/react-countup/releases)
- [Commits](glennreyes/react-countup@v6.4.1...v6.4.2)

---
updated-dependencies:
- dependency-name: react-countup
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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ui/package.json

@@ -42,7 +42,7 @@
     "query-string": "^8.1.0",
     "react": "^16.13.1",
     "react-colorful": "^5.5.1",
-    "react-countup": "^6.4.1",
+    "react-countup": "^6.4.2",
     "react-datasheet": "1.4.12",
     "react-dom": "^16.13.1",
     "react-draggable": "^4.4.4",