Update dependency postcss to v8.3.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.3.6 -> 8.3.7

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Release Notes

postcss/postcss

v8.3.7

Compare Source

• Replaced colorette to nanocolors.
• Added bug field to package.json (by Christian Oliff).
• Improved docs (by Andrew Bruce and Paul Shryock).

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Configuration

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[renovate]

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