fix(deps): update dependency postcss-normalize to v9

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
postcss-normalize	dependencies	major	^8.0.1 -> ^9.0.0

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Release Notes

csstools/postcss-normalize

### [`v9.0.0`](https://togithub.com/csstools/postcss-normalize/blob/master/CHANGELOG.md#​900-April-12-2020) [Compare Source](https://togithub.com/csstools/postcss-normalize/compare/7c11ae71a5c827d697fffb9f442e1f4cb9d55a54...9.0.0) - Updated: `normalize.css` to support any version (major) - Updated: `sanitize.css` to support any version (major) - Updated: Node support to 10.0.0 (major). - Removed: Unused `browserslist` dependency

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