build(deps-dev): bump postcss from 8.4.24 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.24 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.24...8.4.31)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

demo/package.json

@@ -27,7 +27,7 @@
     "eslint-plugin-promise": "^6.1.1",
     "eslint-plugin-standard": "^5.0.0",
     "eslint-plugin-vue": "^9.20.1",
-    "postcss": "^8.4.33",
+    "postcss": "^8.4.31",
     "tailwindcss": "^3.4.1",
     "vite": "^5.0.11"
   }

docs/package.json

@@ -34,7 +34,7 @@
     "eslint": "^8.42.0",
     "eslint-plugin-vue": "^9.14.1",
     "github-buttons": "^2.27.0",
-    "postcss": "^8.4.24",
+    "postcss": "^8.4.31",
     "tailwindcss": "^3.3.2",
     "unplugin-icons": "^0.16.3",
     "unplugin-vue-components": "^0.25.1",