chore(deps): update dependency postcss to v8.4.40

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.35 -> 8.4.40

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Release Notes

postcss/postcss (postcss)

### [`v8.4.40`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8440) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.39...8.4.40) - Moved to getter/setter in nodes types to help Sass team (by [@​nex3](https://togithub.com/nex3)). ### [`v8.4.39`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8439) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.38...8.4.39) - Fixed `CssSyntaxError` types (by [@​romainmenke](https://togithub.com/romainmenke)). ### [`v8.4.38`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8438) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.37...8.4.38) - Fixed `endIndex: 0` in errors and warnings (by [@​romainmenke](https://togithub.com/romainmenke)). ### [`v8.4.37`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8437) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.36...8.4.37) - Fixed `original.column are not numbers` error in another case. ### [`v8.4.36`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8436) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.35...8.4.36) - Fixed `original.column are not numbers` error on broken previous source map.

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Configuration

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[coveralls]

coverage: 94.441%. remained the same when pulling ecdbb16f5eaeb6319855398fc1579281a042efbd on renovate/postcss-8.x-lockfile into 279e4eea42e962daf710ec721871cd5ffca97907 on master.

[coveralls]

coverage: 94.441%. remained the same when pulling e0452b1e474eb8726fc5f746da7b10b21b216041 on renovate/postcss-8.x-lockfile into 279e4eea42e962daf710ec721871cd5ffca97907 on master.