Update dependency postcss-cli to v9 - autoclosed

This MR contains the following updates:

Package	Type	Update	Change
postcss-cli	devDependencies	major	8.3.1 -> 9.1.0

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Release Notes

postcss/postcss-cli

v9.1.0

Compare Source

• Don't write to files if they're unchanged (#​320, #​417)

v9.0.2

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• Switch to picocolors (#​409)
• Remove test files from npm package

v9.0.1

Compare Source

• Actually exit with error when attempting to stdout in watch mode
• Remove bin/ from files in package.json

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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