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

[mend-for-github-com]

This PR contains the following updates:

Package	Type	Update	Change
rollup-plugin-postcss	devDependencies	major	^2.0.3 -> ^4.0.0

By merging this PR, the issue #19 will be automatically resolved and closed:

Severity	CVSS Score	CVE
High	7.5	WS-2021-0152
High	7.5	CVE-2021-29059
High	7.5	CVE-2021-33502
High	7.5	CVE-2021-28092
High	7.3	CVE-2020-8116
Medium	5.3	CVE-2021-29060

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Release Notes

egoist/rollup-plugin-postcss

v4.0.1

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Bug Fixes

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

v4.0.0

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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 ward@coding-tech.com

v3.1.8

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Bug Fixes

• make sourceMaps relative to the CSS output file (#​274) (3de028d)

v3.1.7

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Bug Fixes

• types: options is actually optional (#​311) (a7299a4)

v3.1.6

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Bug Fixes

• extract css in same order as imports (#​295) (2946eae)

v3.1.5

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Bug Fixes

• Typing of namedExports option (c38f356)

v3.1.4

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Bug Fixes

• Add types file to package.json files (#​297) (304538d)

v3.1.3

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Bug Fixes

• allow module config while using autoModules (#​281) (#​292) (f7f3fdb), closes developit/microbundle#​653 developit/microbundle#​617

v3.1.2

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Bug Fixes

• replace const keyword with var keyword in output (#​283) (a5fd035)

v3.1.1

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Bug Fixes

• revert "feat: allow multiple entry files and outputs (#​264)" (#​272) (b17c15d)

v3.1.0

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Features

• allow multiple entry files and outputs (#​264) (3ea986c)

v3.0.0

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Documentation

• add v3 usage (#​268) (b27c3eb)

BREAKING CHANGES

• v3 not support rollup v1.
  extract relative path based on bundle root.

v2.9.0

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v2.8.2

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Bug Fixes

• extract relative path (#​262) (0e71f75)

v2.8.1

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Bug Fixes

• AssetInfo modules used for chunk (df71f37)

v2.6.4

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Bug Fixes

• package.json version (437170b)

v2.6.2

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Bug Fixes

• resolve typo (026504e)

v2.6.1

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Bug Fixes

• package.json version (75306fb)

v2.5.0

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Features

• add the typescript declaration file (#​241) (37bb7a1)

v2.4.1

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Bug Fixes

• package.json version (bccf485)

v2.4.0

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Features

• update options.inject (b364cbe)

v2.3.0

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Features

• allow to pass options to built-in loaders (94d23fa), closes #​130

v2.2.0

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Features

• sass-loader: prepend options.data to code payload (#​233) (80bb9da), closes /github.com/differui/rollup-plugin-sass#options-1

v2.1.1

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Bug Fixes

• Github Actions release.yml incorrect (#​234) (6d92baf)

v2.0.6

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Bug Fixes

• windows path (#​190) (f07860d)

v2.0.5

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Bug Fixes

• ignore errors from loadModule utility, closes #​223 (c0a29b0)

v2.0.4

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Improve module loading for preprocessors

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