chore(deps): update dependency cssnano to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cssnano	^5.1.15 -> ^6.0.0

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Release Notes

cssnano/cssnano (cssnano)

### [`v6.0.1`](https://togithub.com/cssnano/cssnano/releases/tag/cssnano%406.0.1): v6.0.1 [Compare Source](https://togithub.com/cssnano/cssnano/compare/cssnano@6.0.0...cssnano@6.0.1) #### Bug Fixes - fix(postcss-merge-rules): do not merge nested rules (https://github.com/cssnano/cssnano/commit/eb9a9a18132d360cb8639f0ca6be4d24401bcde9) - fix(postcss-reduce-idents): minify grid line names correctly (https://github.com/cssnano/cssnano/commit/2af6687e63978a7b0a08f97d095aa9e6b593eb4f) ### [`v6.0.0`](https://togithub.com/cssnano/cssnano/releases/tag/cssnano%406.0.0): v6.0.0 [Compare Source](https://togithub.com/cssnano/cssnano/compare/cssnano@5.1.15...cssnano@6.0.0) #### Major Changes - [`99d1e6a`](https://togithub.com/cssnano/cssnano/commit/99d1e6ab): postcss-normalize-url: remove normalize-url configuration options - [`4e272f8`](https://togithub.com/cssnano/cssnano/commit/4e272f88): postcss-svgo: Upgrade dependency svgo to v3 and increase the minimum supported node version to v14 - [`ca9d3f5`](https://togithub.com/cssnano/cssnano/commit/ca9d3f55): Switch minimum supported Node version to 14 for all packages - [`39a2040`](https://togithub.com/cssnano/cssnano/commit/39a20405): feat!(cssnano): remove undocumented YAML config support #### Migration instructions - If you're not happy with the defaults for the normalize-url transform, turn it off completely. Options were removed as most would change the meaning of the URL, which is unexpcted in the case of CSS minification. - In the unlikely event you're using YAML to configure cssnano, move the cssnano configuration inside the PostCSS config or use a configuration file in CommonJS or JSON format.

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Configuration

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Latest commit: 17d06dc9e9d765042caaf2982086723fa3d544b5

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