Update dependency clean-css-cli to v5.6.3

[renovate[bot]]

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`](https://togithub.com/clean-css/clean-css-cli/blob/HEAD/History.md#563--2023-11-30) [Compare Source](https://togithub.com/clean-css/clean-css-cli/compare/v5.6.2...v5.6.3) \================== - Bumps clean-css dependency to 5.3.3 ### [`v5.6.2`](https://togithub.com/clean-css/clean-css-cli/blob/HEAD/History.md#562--2023-01-19) [Compare Source](https://togithub.com/clean-css/clean-css-cli/compare/v5.6.1...v5.6.2) \================== - Bumps clean-css dependency to 5.3.2 ### [`v5.6.1`](https://togithub.com/clean-css/clean-css-cli/blob/HEAD/History.md#561--2022-07-13) [Compare Source](https://togithub.com/clean-css/clean-css-cli/compare/v5.6.0...v5.6.1) \================== - Bumps clean-css dependency to 5.3.1. ### [`v5.6.0`](https://togithub.com/clean-css/clean-css-cli/blob/HEAD/History.md#560--2022-03-31) [Compare Source](https://togithub.com/clean-css/clean-css-cli/compare/v5.5.2...v5.6.0) \================== - Bumps clean-css dependency to 5.3.0. ### [`v5.5.2`](https://togithub.com/clean-css/clean-css-cli/blob/HEAD/History.md#552--2022-01-28) [Compare Source](https://togithub.com/clean-css/clean-css-cli/compare/v5.5.1...v5.5.2) \================== - Bumps clean-css dependency to 5.2.4. ### [`v5.5.1`](https://togithub.com/clean-css/clean-css-cli/blob/HEAD/History.md#551--2022-01-26) [Compare Source](https://togithub.com/clean-css/clean-css-cli/compare/v5.5.0...v5.5.1) \================== - Bumps clean-css dependency to 5.2.3. ### [`v5.5.0`](https://togithub.com/clean-css/clean-css-cli/blob/HEAD/History.md#550--2021-12-08) [Compare Source](https://togithub.com/clean-css/clean-css-cli/compare/v5.4.2...v5.5.0) \================== - Adds a new `--watch` switch, which makes CLI re-run optimizations when watched file(s) change. ### [`v5.4.2`](https://togithub.com/clean-css/clean-css-cli/blob/HEAD/History.md#542--2021-10-21) [Compare Source](https://togithub.com/clean-css/clean-css-cli/compare/v5.4.1...v5.4.2) \================== - Bumps clean-css dependency to 5.2.2.

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