Update dependency autoprefixer to v9.8.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
autoprefixer	9.8.6 → 9.8.8

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Release Notes

postcss/autoprefixer (autoprefixer)

v9.8.8

Compare Source

• Replaced nanocolors with picocolors.
• Reduced package size.

v9.8.7

Compare Source

• Replaced colorette with nanocolors.
• Reduced package size.

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