Update dependency postcss to v8.4.40

[renovate]

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

Compare Source

• Moved to getter/setter in nodes types to help Sass team (by @​nex3).

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