Update dependency cssnano to v6.0.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cssnano	6.0.1 -> 6.0.2

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Release Notes

cssnano/cssnano (cssnano)

### [`v6.0.2`](https://togithub.com/cssnano/cssnano/releases/tag/cssnano%406.0.2): v6.0.2 [Compare Source](https://togithub.com/cssnano/cssnano/compare/cssnano@6.0.1...cssnano@6.0.2)

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Configuration

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🚦 Automerge: Enabled.

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