build(deps): bump postcss-selector-parser from 6.1.2 to 7.0.0

Bumps [postcss-selector-parser](https://github.com/postcss/postcss-selector-parser) from 6.1.2 to 7.0.0.
- [Release notes](https://github.com/postcss/postcss-selector-parser/releases)
- [Changelog](https://github.com/postcss/postcss-selector-parser/blob/master/CHANGELOG.md)
- [Commits](postcss/postcss-selector-parser@v6.1.2...v7.0.0)

---
updated-dependencies:
- dependency-name: postcss-selector-parser
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

packages/purgecss/package.json

@@ -43,7 +43,7 @@
     "commander": "^12.1.0",
     "glob": "^11.0.0",
     "postcss": "^8.4.47",
-    "postcss-selector-parser": "^6.1.2"
+    "postcss-selector-parser": "^7.0.0"
   },
   "bugs": {
     "url": "https://github.com/FullHuman/purgecss/issues"