chore(deps): update dependency cssnano to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cssnano	4.1.11 -> 5.0.8

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Release Notes

cssnano/cssnano

v5.0.8

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Chore

• postcss-minify-gradients: remove extra dependencies (#​1181) (50eb53)

v5.0.7

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Bug Fixes

• cssnano: reduce dependencies by moving from cosmiconfig to lilconfig (#​1168)
  (506a8232)

v5.0.6

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Bug Fixes

postcss-normalize-url: bump normalize-url dependency to 6.0.1 (#​1142)
(b60f54bed)

postcss-ordered-values: preserve columns count (#​1144)
(9acd6a2fe3e)

v5.0.5

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Bug fixes

• Preserve alpha channel in color minification
• Check overlaps more exhaustively when merging rules
• Do not crash when the input CSS contains relative URLs

v5.0.4

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Bug fixes

• postcss-colormin: Strict color parsing (#​1122) (32771da)
• postcss-colormin: fix ERR_PACKAGE_PATH_NOT_EXPORTED (#​1110) (8a31ca38796)

v5.0.3

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v5.0.2

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Bug Fixes

• postcss-merge-longhand: mergeLonghand should not apply to CSS variables (#​1057) (8aa64c7), closes #​1051

v5.0.1

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v5.0.0

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Major changes

• requires Node >= 10.13
• PostCSS 8 API, so cssnano 5 does not emit warnings when running under PostCSS 8
• updated to SVGO 2, fixing many SVG minification bugs
• updated css-value-parser and css-selector-parser, fixing many bugs

Upgrade notes

If you use the cssnano JavaScript API, you need to change your code:

• Replace cssnano.process() with cssnano().process() (notice the () after cssnano)

• pass cssnano options to cssnano() instead of process()

cssnano(cssnanoOptions).process(postcssOptions)

Bug fixes

• fix improperly discarding @font-face declarations #​726
• partially fix some isues where cssnano did not combine rules when used together with postcss-nested #​1004
• fix translate3d() minification #​920
• fix minification of values starting with e #​589, #​984
• fix minification of percentage vaalues #​962, #​957
• fix minification of aspect-ratio #​963
• fix merging of @supports rules #​974
• fix sorting of longhand and shorthand properties #​535
• remove vulnerable dependency and always warn with bad SVG input #​1034

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