Update dependency cssnano to v7.0.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cssnano	7.0.3 -> 7.0.4

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Release Notes

cssnano/cssnano (cssnano)

### [`v7.0.4`](https://togithub.com/cssnano/cssnano/releases/tag/cssnano%407.0.4): v7.0.4 [Compare Source](https://togithub.com/cssnano/cssnano/compare/cssnano@7.0.3...cssnano@7.0.4) #### Bug fixes - fix(postcss-convert-values): preserve percent sign in border-image-width in [https://github.com/cssnano/cssnano/pull/1645](https://togithub.com/cssnano/cssnano/pull/1645)

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Configuration

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🚦 Automerge: Enabled.

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