build(deps-dev): bump postcss from 8.4.21 to 8.4.31

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](postcss/postcss@8.4.21...8.4.31)

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

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

package.json

@@ -16,7 +16,7 @@
   "devDependencies": {
     "@vitejs/plugin-vue": "^4.1.0",
     "autoprefixer": "^10.4.14",
-    "postcss": "^8.4.21",
+    "postcss": "^8.4.31",
     "tailwindcss": "^3.3.1",
     "vite": "^4.2.0"
   }