Bump postcss-nesting from 12.0.4 to 13.0.1

Bumps [postcss-nesting](https://github.com/csstools/postcss-plugins/tree/HEAD/plugins/postcss-nesting) from 12.0.4 to 13.0.1.
- [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:development
  update-type: version-update:semver-major
...

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

polaris-react/package.json

@@ -108,7 +108,7 @@
     "postcss-loader": "^4.2.0",
     "postcss-mixins": "^9.0.4",
     "postcss-modules": "^4.2.2",
-    "postcss-nesting": "^12.0.2",
+    "postcss-nesting": "^13.0.1",
     "postcss-pxtorem": "^6.0.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",