Bump clean-css from 4.1.2 to 4.2.3

[dependabot[bot]]

Bumps clean-css from 4.1.2 to 4.2.3.

Changelog

Sourced from clean-css's changelog.

4.2.3 / 2020-01-28

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

4.2.2 / 2020-01-25

• 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.

4.2.1 / 2018-08-07

• Fixes giving breakWith option via a string.

4.2.0 / 2018-08-02

• 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.

4.1.11 / 2018-03-06

• Backports fixes to ReDOS vulnerabilities in validator code.

4.1.10 / 2018-03-05

• Fixed issue #988 - edge case in dropping default animation-duration.
• Fixed issue #989 - edge case in removing unused at rules.
• Fixed issue #1001 - corrupted tokenizer state.
• Fixed issue #1006 - edge case in handling invalid source maps.
• Fixed issue #1008 - edge case in breaking up font shorthand.

4.1.9 / 2017-09-19

• Fixed issue #971 - edge case in removing unused at rules.

... (truncated)

Commits

• d0ad142 Version 4.2.3.
• f47397c Fixes #1106 - regression in handling RGBA and HSLA colors.
• a75f942 Bumps web interface to version 4.2.2.
• 58d80f8 Version 4.2.2.
• e79454c Adds missing changelog entries.
• e1410e4 fix(colors): convert rgba/hsla to rgb/hsl if opacity is >= 1 (#1083)
• 9b1ed5b Prevent unquoting on grid elements (#1085)
• 31379cd Fix local fonts with colors in name (#1077)
• da25f4f Prevent error if property block has no value (level 0) (#1061)
• b01dd75 Bumps web interface to version 4.2.1.
• Additional commits viewable in compare view

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