Update dependency classnames to v2.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
classnames	2.2.6 -> 2.3.0

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Release Notes

JedWatson/classnames

### [`v2.3.0`](https://togithub.com/JedWatson/classnames/blob/master/HISTORY.md#v230--2021-04-01) [Compare Source](https://togithub.com/JedWatson/classnames/compare/v2.2.6...v2.3.0) - Added TypeScript types - Added consistent support for custom `.toString()` methods on arguments, thanks [Stanislav Titenko](https://togithub.com/resetko)

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