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](https://github.com/postcss/postcss-selector-parser/compare/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>

package.json

@@ -90,7 +90,7 @@
     "postcss-js": "^4.0.1",
     "postcss-load-config": "^6.0.1",
     "postcss-nested": "^7.0.2",
-    "postcss-selector-parser": "^6.1.2",
+    "postcss-selector-parser": "^7.0.0",
     "postcss-value-parser": "^4.2.0",
     "queue-microtask": "^1.2.3",
     "read-cache": "^1.0.0",