chore(deps): update dependency cssnano to v5 - autoclosed

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
cssnano	devDependencies	major	4.1.10 -> 5.0.0

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	7.5	CVE-2021-28092	#8
High	7.5	CVE-2021-29059	#18
High	7.5	CVE-2021-3803	#27
High	7.5	WS-2021-0152	#25

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Release Notes

cssnano/cssnano (cssnano)

### [`v5.0.0`](https://togithub.com/cssnano/cssnano/releases/tag/cssnano%405.0.0): v5.0.0 [Compare Source](https://togithub.com/cssnano/cssnano/compare/v4.1.11...cssnano@5.0.0) #### 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](https://togithub.com/cssnano/cssnano/issues/726) - partially fix some isues where cssnano did not combine rules when used together with `postcss-nested` [#​1004](https://togithub.com/cssnano/cssnano/issues/1004) - fix `translate3d()` minification [#​920](https://togithub.com/cssnano/cssnano/issues/920) - fix minification of values starting with `e` [#​589](https://togithub.com/cssnano/cssnano/issues/958), [#​984](https://togithub.com/cssnano/cssnano/issues/984) - fix minification of percentage vaalues [#​962](https://togithub.com/cssnano/cssnano/issues/962), [#​957](https://togithub.com/cssnano/cssnano/issues/957) - fix minification of `aspect-ratio` [#​963](https://togithub.com/cssnano/cssnano/issues/963) - fix merging of `@supports` rules [#​974](https://togithub.com/cssnano/cssnano/issues/974) - fix sorting of longhand and shorthand properties [#​535](https://togithub.com/cssnano/cssnano/issues/535) - remove vulnerable dependency and always warn with bad SVG input [#​1034](https://togithub.com/cssnano/cssnano/pull/1034) ### [`v4.1.11`](https://togithub.com/cssnano/cssnano/releases/tag/v4.1.11) [Compare Source](https://togithub.com/cssnano/cssnano/compare/v4.1.10...v4.1.11) ### 4.1.11 #### Bug Fixes - fix [CVE-2021-28092](https://nvd.nist.gov/vuln/detail/CVE-2021-28092)

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