Bump postcss-nesting from 11.3.0 to 12.0.0

Bumps [postcss-nesting](https://github.com/csstools/postcss-plugins/tree/HEAD/plugins/postcss-nesting) from 11.3.0 to 12.0.0.
- [Changelog](https://github.com/csstools/postcss-plugins/blob/main/plugins/postcss-nesting/CHANGELOG.md)
- [Commits](https://github.com/csstools/postcss-plugins/commits/HEAD/plugins/postcss-nesting)

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

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

package.json

@@ -45,7 +45,7 @@
     "minimist": "^1.2.5",
     "postcss": "^8.3.6",
     "postcss-import": "^15.0.0",
-    "postcss-nesting": "^11.0.0",
+    "postcss-nesting": "^12.0.0",
     "postcss-url": "^10.1.3",
     "pretty": "^2.0.0",
     "pretty-tree": "^1.0.0",