Bump @tailwindcss/postcss from 4.1.2 to 4.2.0 (#13)

Bumps [@tailwindcss/postcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/@tailwindcss-postcss) from 4.1.2 to 4.2.0.
- [Release notes](https://github.com/tailwindlabs/tailwindcss/releases)
- [Changelog](https://github.com/tailwindlabs/tailwindcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tailwindlabs/tailwindcss/commits/v4.2.0/packages/@tailwindcss-postcss)

---
updated-dependencies:
- dependency-name: "@tailwindcss/postcss"
  dependency-version: 4.2.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

examples/nextjs-app/package.json

@@ -19,7 +19,7 @@
     "tailwind-merge": "^3.4.0"
   },
   "devDependencies": {
-    "@tailwindcss/postcss": "^4.1.2",
+    "@tailwindcss/postcss": "^4.2.0",
     "@types/node": "^22",
     "@types/react": "catalog:",
     "@types/react-dom": "catalog:",

packages/core/package.json

@@ -54,7 +54,7 @@
   },
   "devDependencies": {
     "@eslint/js": "catalog:",
-    "@tailwindcss/postcss": "^4.1.2",
+    "@tailwindcss/postcss": "^4.2.0",
     "@testing-library/react": "^16.3.2",
     "@testing-library/user-event": "^14.6.1",
     "@types/node": "^22",