Update dependency clean-css to v4.2.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
clean-css	4.1.11 -> 4.2.4

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Release Notes

clean-css/clean-css

v4.2.4

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v4.2.3

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• Fixed issue #​1106 - regression in handling RGBA/HSLA colors.

v4.2.2

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• Fixed error when property block has no value.
• Fixed issue #​1077 - local fonts with color in name.
• Fixed issue #​1082 - correctly convert colors if alpha >= 1.
• Fixed issue #​1085 - prevent unquoting of grid elements.

v4.2.1

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• Fixes giving breakWith option via a string.

v4.2.0

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• Adds process method for compatibility with optimize-css-assets-webpack-plugin.
• Fixed issue #​861 - new transition property optimizer.
• Fixed issue #​895 - ignoring specific styles.
• Fixed issue #​947 - selector based filtering.
• Fixed issue #​964 - adds configurable line breaks.
• Fixed issue #​986 - level 2 optimizations and CSS 4 colors.
• Fixed issue #​1000 - carriage return handling in tokenizer.
• Fixed issue #​1038 - font-variation-settings quoting.
• Fixes ReDOS vulnerabilities in validator code.

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