Update dependency postcss-cli to v12

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss-cli	^11.0.1 → ^12.0.0

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Release Notes

postcss/postcss-cli (postcss-cli)

v12.0.0

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• If using a YAML config, the yaml package must be installed separately (#​478)
• Requires Node.js v22+ (#​525)
• Errors if --config is passed, but no config is found (#​467, #​522)
• Now properly exits with an error if invalid options/configuration are passed in watch mode (#​527)
• Upgrade to chokidar v5; which results in slightly different handling of dir-dependency messages in watch mode (#​501)
• Properly watchs all config files if there are multiple config files (#​536)
• Minimized dependencies by removing fs-extra (#​510)
• Internal refactoring

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