fix(deps): update dependency cssnano to v6

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cssnano	^5.1.10 -> ^6.0.0

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Release Notes

cssnano/cssnano

v6.0.1: v6.0.1

Compare Source

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: v6.0.0

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Major Changes

• 99d1e6a: postcss-normalize-url: remove normalize-url configuration options
• 4e272f8: postcss-svgo: Upgrade dependency svgo to v3 and increase the minimum supported node version to v14
• ca9d3f5: Switch minimum supported Node version to 14 for all packages
• 39a2040: 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.

v5.1.15: v5.1.15

Compare Source

Bug Fixes

• fix(postcsss-reduce-initial): fix mask-repeat conversion
• fix(postcss-colormin): don't minify colors in src declarations
• fix(postcss-merge-rules): do not merge conflicting flex and border properties

v5.1.14: v5.1.14

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Bug Fixes

• fix: update autoprefixer and browserslist
• fix(postcss-reduce-initial): improve initial properties data

v5.1.13: v5.1.13

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Bug Fixes

• fix TypeScript type of cssnano() return value (https://github.com/cssnano/cssnano/commit/b92dbe3ab1db16141dc6296cd350f3fdf5c2defe)

v5.1.12: v5.1.12

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Bug Fixes

• fix: preserve hyphenated property case (https://github.com/cssnano/cssnano/commit/120a88899376a29c8756234fdc648c519921f515)
• fix: ensure sorting properties does not break the output (https://github.com/cssnano/cssnano/commit/0a3a1331e29f3d1009d2a938181ffa4b34ab5b32)
• fix: recognize 'constant' as a function (https://github.com/cssnano/cssnano/commit/858a8b77c951f3698b14e834f38128b176438edc)

v5.1.11: v5.1.11

Compare Source

Bug Fixes

• postcss-ordered-values: preserve constant values (32ab4d9b7d20d)

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