chore(deps): update dependency rollup-plugin-postcss to v4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup-plugin-postcss	3.1.8 -> 4.0.2

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Release Notes

egoist/rollup-plugin-postcss (rollup-plugin-postcss)

v4.0.2

Compare Source

Bug Fixes

• prioritize dart-sass over node-sass (#​402) (caf3429)

v4.0.1

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Bug Fixes

• update to cssnano 5 (#​357) (118253e)

v4.0.0

Compare Source

Features

• upgrade postcss to 8.x (ceee1bc)

BREAKING CHANGES

• upgrade postcss to 8.x

Co-authored-by: Edward Elric <SASUKE688848@​gmail.com> Co-authored-by: Ward Peeters [email protected]

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