Update dependency @fullhuman/postcss-purgecss to v2.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@fullhuman/postcss-purgecss	devDependencies	minor	2.0.6 -> 2.1.0

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Release Notes

FullHuman/purgecss

### [`v2.1.0`](https://togithub.com/FullHuman/purgecss/compare/v2.0.6...v2.1.0) [Compare Source](https://togithub.com/FullHuman/purgecss/compare/v2.0.6...v2.1.0)

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