Update dependency postcss-cli to v9 - autoclosed

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-cli	8.3.1 -> 9.0.0

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Release Notes

postcss/postcss-cli

v9.0.0

Compare Source

• BREAKING: Require Node.js v12+
• BREAKING: Must specify full file path, including .js extension, when loading local plugins with --use (#​401)
• BREAKING: Officially remove support for watching postcss config (was already broken in previous releases)
• Add support for dir-dependency messages (#​383, #​391)
• Update deps

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