RenovateBot: Update dependency postcss-cli to v10

This MR contains the following updates:

Package	Type	Update	Change
postcss-cli	dependencies	major	^9.0.0 -> ^10.0.0

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Release Notes

postcss/postcss-cli

v10.0.0

Compare Source

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

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