chore(deps-dev): bump postcss-js from 3.0.3 to 4.0.1

Bumps [postcss-js](https://github.com/postcss/postcss-js) from 3.0.3 to 4.0.1.
- [Changelog](https://github.com/postcss/postcss-js/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss-js@3.0.3...4.0.1)

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

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

Author: dependabot[bot]

packages/prism/package.json

@@ -36,7 +36,7 @@
     "@types/react": "^18.2.12",
     "param-case": "^3.0.4",
     "postcss": "^8.1.10",
-    "postcss-js": "^3.0.3",
+    "postcss-js": "^4.0.1",
     "react": "^18.1.0",
     "theme-ui": "workspace:^"
   },