chore(deps): update @thibaudcolas/stylelint-config-cookbook to v4

[renovate[bot]]

This PR contains the following updates:

Package	Update	Type	Change	Sourcegraph
@thibaudcolas/stylelint-config-cookbook	major	devDependencies	3.0.1 -> 4.0.0

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Release Notes

thibaudcolas/stylelint-config-cookbook

### [`v4.0.0`](https://togithub.com/thibaudcolas/stylelint-config-cookbook/blob/master/CHANGELOG.md#​400httpsgithubcomthibaudcolasstylelint-config-cookbookcomparev301v400-2020-02-16) [Compare Source](https://togithub.com/thibaudcolas/stylelint-config-cookbook/compare/v3.0.1...v4.0.0) ##### Features - **config:** enable new rules from stylelint-scss ([09e1c1d](https://togithub.com/thibaudcolas/stylelint-config-cookbook/commit/09e1c1dda00d977a048633eaacd876d76358ab7e)) - **deps:** update all extension dependencies ([dbade38](https://togithub.com/thibaudcolas/stylelint-config-cookbook/commit/dbade3835f6280062600a56ff483a8212430a3a4)) - **deps:** upgrade to stylelint v12 ([3894179](https://togithub.com/thibaudcolas/stylelint-config-cookbook/commit/3894179241129a9c61bfa04b73d348fb81141e72)) ##### BREAKING CHANGES - **config:** this enables 9 new rules from stylelint-scss. - `scss/no-duplicate-mixins` - `scss/map-keys-quotes` - `scss/function-unquote-no-unquoted-strings-inside` - `scss/function-quote-no-quoted-strings-inside` - `scss/dimension-no-non-numeric-values` - `scss/comment-no-loud` - `scss/at-import-partial-extension` - `scss/at-if-no-null` - `scss/at-each-key-value-single-line` - **deps:** the config now depends on stylelint v12. #### [3.0.1](https://togithub.com/thibaudcolas/stylelint-config-cookbook/compare/v3.0.0...v3.0.1) (2019-08-29) ##### Bug Fixes - **config:** whitelist the `initial` keyword instead of variables ([7260318](https://togithub.com/thibaudcolas/stylelint-config-cookbook/commit/7260318))

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