Bump date-fns from 2.20.1 to 2.21.1 in /kafka-ui-react-app (#412)

Bumps [date-fns](https://github.com/date-fns/date-fns) from 2.20.1 to 2.21.1.
- [Release notes](https://github.com/date-fns/date-fns/releases)
- [Changelog](https://github.com/date-fns/date-fns/blob/master/CHANGELOG.md)
- [Commits](date-fns/date-fns@v2.20.1...v2.21.1)

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