Update dependency purgecss-webpack-plugin to v4.1.2

This MR contains the following updates:

Package	Type	Update	Change
purgecss-webpack-plugin (source)	dependencies	minor	4.0.3 -> 4.1.2

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Release Notes

FullHuman/purgecss

v4.1.2

Compare Source

v4.1.1

Compare Source

v4.1.0

Compare Source

Bug Fixes

• Allow Absolute Paths (#​679) (15335a2)
• css variable removed when declared in wrong order (89ece42), closes #​518
• Fix interaction with other plugins (#​647) (fb08e3a)
• grunt-purgecss: Fix plugin not ouputting all files (#​723) (646e419)
• gulp-purgecss: fix support for stream input (fd5d3bf)
• Keep keyframe decimals for prefixed @​keyframes (#​749) (b804441)
• purgecss-from-pug: class attribute with multiple values not correctly handled with pug (#​678) (ba6285d), closes #​677

Features

• add dynamicAttributes option (2f9cc65)
• add option to ouput unused css (#​763) (3a3d958)
• add purgecss-from-tsx (#​716) (e556afc)
• export all types #​780 (1a959c6)
• new purgecss-from-jsx plugin (#​692) (3570c7d)

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