Update dependency clean-css-cli to v5

Created by: renovate[bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
clean-css-cli	4.3.0 -> 5.0.0

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Release Notes

jakubpawlowicz/clean-css-cli

v5.0.0

Compare Source

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• Adds --batch-suffix option to specify what gets appended to output filename in batch mode.
• Bumps clean-css dependency to 5.0.
• Bumps commander dependency to 7.0.
• Fixed issue #​18 - allows batch processing of input files.
• Fixed issue #​36 - automatically creates missing output directories.

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