Update dependency clean-css-cli to v5.6.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
clean-css-cli	5.4.1 -> 5.6.3

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Release Notes

clean-css/clean-css-cli (clean-css-cli)

v5.6.3

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• Bumps clean-css dependency to 5.3.3

v5.6.2

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• Bumps clean-css dependency to 5.3.2

v5.6.1

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• Bumps clean-css dependency to 5.3.1.

v5.6.0

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• Bumps clean-css dependency to 5.3.0.

v5.5.2

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• Bumps clean-css dependency to 5.2.4.

v5.5.1

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• Bumps clean-css dependency to 5.2.3.

v5.5.0

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• Adds a new --watch switch, which makes CLI re-run optimizations when watched file(s) change.

v5.4.2

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• Bumps clean-css dependency to 5.2.2.

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