Bump postcss to ^8.4.39

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	^8.4.38 -> ^8.4.39

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Release Notes

postcss/postcss (postcss)

v8.4.39

Compare Source

• Fixed CssSyntaxError types (by @​romainmenke).

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