RenovateBot: Update dependency postcss to v8.4.25

This MR contains the following updates:

Package	Type	Update	Change
postcss (source)	dependencies	patch	8.4.24 -> 8.4.25

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Release Notes

postcss/postcss (postcss)

v8.4.25

Compare Source

• Improve stringify performance (by Romain Menke).
• Fixed docs (by @​vikaskaliramna07).

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Configuration

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