build(deps-dev): bump postcss (#1923)

Bumps the patch-dependencies group in /react-tailwind-template with 1 update: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.5.3 to 8.5.4
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.3...8.5.4)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: patch-dependencies
...

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

Author: dependabot[bot]

react-tailwind-template/package-lock.json

@@ -26,7 +26,7 @@
     "eslint": "^9.27.0",
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.20",
-    "postcss": "^8.5.2",
+    "postcss": "^8.5.4",
     "tailwindcss": "^3.4.17",
     "typescript": "^5.8.3",
     "vite": "^6.3.5"