Bump "@fullhuman/postcss-purgecss" package version

[updateclibot]

Bump "@fullhuman/postcss-purgecss" package version

Bump "@fullhuman/postcss-purgecss" package version to 8.0.0

ran shell command "npm install --package-lock-only --dry-run=$DRY_RUN @fullhuman/postcss-purgecss@8.0.0"

v8.0.0

### BREAKING CHANGES

- Revert the changes from v7.0.2 that modified the import of the PostCSS plugin. This was causing issues (see [#1295](https://github.com/FullHuman/purgecss/issues/1295)). The PostCSS plugin should now be imported via a default import:
```ts
import purgeCSSPlugin from '@fullhuman/postcss-purgecss';
```

### Features

* feat: add --preserve-paths option to CLI for maintaining folder hierarchy ([aa5ac9d](https://github.com/FullHuman/purgecss/commit/aa5ac9d)), closes [#377](https://github.com/FullHuman/purgecss/issues/377)

### Bug fixes

* fix:  for code scanning alert no. 5: Incomplete multi-character sanitization (#1403) ([3f39411](https://github.com/FullHuman/purgecss/commit/3f39411)), closes [#1403](https://github.com/FullHuman/purgecss/issues/1403)
* fix: enhance setOptions to support both ES modules and CommonJS config exports ([4ad48c4](https://github.com/FullHuman/purgecss/commit/4ad48c4)), closes [#1340](https://github.com/FullHuman/purgecss/issues/1340)
* fix: fix glob expression illegal operations on directories (#1308) ([b27293f](https://github.com/FullHuman/purgecss/commit/b27293f)), closes [#1308](https://github.com/FullHuman/purgecss/issues/1308) [#1266](https://github.com/FullHuman/purgecss/issues/1266)
* fix: update import statements for purgeCSSPlugin in documentation and source files ([e5cbce2](https://github.com/FullHuman/purgecss/commit/e5cbce2)), closes [#1295](https://github.com/FullHuman/purgecss/issues/1295)
* fix(#995): preserve relative paths in source maps ([4f6c4d9](https://github.com/FullHuman/purgecss/commit/4f6c4d9)), closes [#995](https://github.com/FullHuman/purgecss/issues/995)
* fix: enhance keyframes handling to preserve animations referenced via CSS variables ([076c027](https://github.com/FullHuman/purgecss/commit/076c027)), closes [#478](https://github.com/FullHuman/purgecss/issues/478)

## New Contributors
* @aminya made their first contribution in https://github.com/FullHuman/purgecss/pull/1308

**Full Changelog**: https://github.com/FullHuman/purgecss/compare/v7.0.2...v8.0.0

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