Update dependency cssnano to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
cssnano	^7.0.0 → ^8.0.0

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Release Notes

cssnano/cssnano (cssnano)

v8.0.1: v8.0.1

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What's Changed

• fix(postcss-minify-selectors): reject :is() fold when divergent middle contains a combinator under a non-empty prefix (closes #​1786) by @​dkryaklin in #​1798
• fix(postcss-minify-selectors): tighten :is() fold acceptance to a strict allowlist by @​dkryaklin in #​1799

Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.0...cssnano@8.0.1

v8.0.0: v8.0.0

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What's Changed

• Move declaration sorter to advanced preset by @​ludofischer and @​Goodwine in #​1793
• Drop node 20 by @​ludofischer in #​1794

Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@7.1.9...cssnano@8.0.0

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