Update dependency postcss-cli to v11

This MR contains the following updates:

Package	Type	Update	Change
postcss-cli	devDependencies	major	8.3.1 -> 11.0.0

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Release Notes

postcss/postcss-cli (postcss-cli)

v11.0.0

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• BREAKING: Require Node.js v18+ (#​464)
• Upgrade to postcss-load-config@5 for improved ESM & TS config support (#​461, #​462)

v10.1.0

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• Allow running --watch mode in non-TTY contexts, like Docker (#​448)
• Update dependencies

v10.0.0

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• BREAKING: Drop Node 12 support (#​438)
• Add support for ESM config files (#​437)

v9.1.0

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• 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

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

v9.0.0

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• 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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