build(deps): Bump postcss-import from 14.1.0 to 15.0.0 in /docs (#13505)

* build(deps): Bump postcss-import from 14.1.0 to 15.0.0 in /docs

Bumps [postcss-import](https://github.com/postcss/postcss-import) from 14.1.0 to 15.0.0.
- [Release notes](https://github.com/postcss/postcss-import/releases)
- [Changelog](https://github.com/postcss/postcss-import/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss-import/compare/14.1.0...15.0.0)

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

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docs/package.json

@@ -27,7 +27,7 @@
     "autoprefixer": "^10.4.12",
     "clsx": "^1.2.1",
     "postcss": "^8.4.17",
-    "postcss-import": "^14.1.0",
+    "postcss-import": "^15.0.0",
     "prism-react-renderer": "^1.3.5",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",