Update dependency clean-css to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
clean-css	4.2.1 -> 5.1.2

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Release Notes

jakubpawlowicz/clean-css

v5.1.2

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• Fixed issue #​996 - space removed from pseudo classes.

v5.1.1

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• Fixed issue #​1156 - invalid hsl/hsla validation in level 2 optimizations.

v5.1.0

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• Fixes stripping '%' from inside color functions.
• Improves tokenization speed by ~30%.
• Fixed issue #​1143 - some missing level 1 value optimizations.

v5.0.1

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• Fixed issue #​1139 - overriding & merging properties without canOverride set.

v5.0.0

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• Adds a way process input files without bundling it into one big output file.
• Adds level 1 and level 2 optimization plugins.
• Disables URL rebasing by default.
• Disables URL unquoting by default.
• Drops support for Node.js 6 & 8 to support last 3 Node.js releases: 10, 12, and 14.
• Fixed issue #​889 - whitelisted level 1 optimizations.
• Fixed issue #​975 - incorrect block name optimization.
• Fixed issue #​1009 - whitespace around comments.
• Fixed issue #​1021 - allow one- and two-letter property names.
• Fixed issue #​1022 - merging into shorthands new property positioning.
• Fixed issue #​1032 - wrong order of merged shorthands with inherit.
• Fixed issue #​1043 - calc fallback removed within other function.
• Fixed issue #​1045 - non-standard protocol-less URL first slash removed.
• Fixed issue #​1050 - correctly keeps default animation duration if delay is also set.
• Fixed issue #​1053 - treats calc() as first class width value.
• Fixed issue #​1055 - supports 4- and 8-character hex with alpha color notation.
• Fixed issue #​1057 - level 2 optimizations and quoted font family name.
• Fixed issue #​1059 - animation time units as CSS expressions.
• Fixed issue #​1060 - variable removed when shorthand's only value.
• Fixed issue #​1062 - wrong optimization of CSS pseudo-classes with selector list.
• Fixed issue #​1073 - adds support for non-standard rpx units.
• Fixed issue #​1075 - media merging and variables.
• Fixed issue #​1087 - allow units with any case.
• Fixed issue #​1088 - building source maps with source preserved via comments.
• Fixed issue #​1090 - edge case in merging for border and border-image.
• Fixed issue #​1103 - don't allow merging longhand into unset shorthand.
• Fixed issue #​1115 - incorrect multiplex longhand into shorthand merging.
• Fixed issue #​1117 - don't change zero values inside min, max, and clamp functions.
• Fixed issue #​1122 - don't wrap data URI in single quotes.
• Fixed issue #​1125 - quotes stripped from withing @supports clause.
• Fixed issue #​1128 - take variables into account when reordering properties.
• Fixed issue #​1132 - vendor-prefixed classes inside :not().
• Reworks all level 1 optimizations to conform to plugin style.

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.

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