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)	8.4.39 -> 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)).

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