Update dependency cssnano to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
cssnano	8.0.10 → 9.0.1

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Release Notes

cssnano/cssnano (cssnano)

v9.0.1: v9.0.1

Compare Source

What's Changed

• refactor: some small performance gains in #​1955

Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.0...cssnano@9.0.1

v9.0.0: v9.0.0

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What's Changed

Breaking changes

• Migrate to ESM and simplify config loading in #​1948

Probably backward-compatible for most users. Some changes to configuration loading documented in migration guide.

Bug fixes

• Introduce new postcss-calc plugin in 34aec91

Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.10...cssnano@9.0.0

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