RenovateBot: Update dependency @fullhuman/postcss-purgecss to v7

This MR contains the following updates:

Package	Type	Update	Change
@fullhuman/postcss-purgecss (source)	dependencies	major	^6.0.0 -> ^7.0.0

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Release Notes

FullHuman/purgecss (@​fullhuman/postcss-purgecss)

v7.0.2

Compare Source

Bug Fixes

• fix: fix issue where pseudo classes like :where, :not, :is were always removed at root level (89024ce), closes #​1282 #​978
• build: add named export for postcss plugin (87d15b7), closes #​1263

Features

• feat(purgecss-from-pug): returns ExtractorResultDetailed instead of selectors (fb51dc6)

BREAKING CHANGES

• PostCSS plugin should now be imported via purgeCSSPlugin

import { purgeCSSPlugin } from '@​fullhuman/postcss-purgecss';

• drop support for node 18.

Other

• build(deps-dev): update dependencies
• build(deps): update dependencies

Full Changelog: https://github.com/FullHuman/purgecss/compare/v6.0.0...v7.0.2

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