Bump postcss-nested from 5.0.6 to 6.0.0

Bumps [postcss-nested](https://github.com/postcss/postcss-nested) from 5.0.6 to 6.0.0.
- [Release notes](https://github.com/postcss/postcss-nested/releases)
- [Changelog](https://github.com/postcss/postcss-nested/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss-nested@5.0.6...6.0.0)

---
updated-dependencies:
- dependency-name: postcss-nested
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -35,7 +35,7 @@
     "postcss-hash": "^3.0.0",
     "postcss-import": "^15.0.0",
     "postcss-mixins": "^9.0.4",
-    "postcss-nested": "^5.0.6",
+    "postcss-nested": "^6.0.0",
     "postcss-nesting": "^10.1.10",
     "postcss-scss": "^4.0.5",
     "postcss-simple-vars": "^7.0.0",