Bump postcss from 8.4.21 to 8.4.31 (#67)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.21 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.4.21...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Saeed Vaziry <61919774+saeedvaziry@users.noreply.github.com>

package.json

@@ -15,7 +15,7 @@
         "axios": "^1.1.2",
         "laravel-echo": "^1.15.0",
         "laravel-vite-plugin": "^0.7.2",
-        "postcss": "^8.4.6",
+        "postcss": "^8.4.31",
         "pusher-js": "^4.3.1",
         "tailwindcss": "^3.1.0",
         "toastr": "^2.1.4",