build(deps-dev): bump postcss from 8.4.26 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.26 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/8.4.26...8.4.31)

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

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

app/package.json

@@ -31,7 +31,7 @@
   "devDependencies": {
     "@vitejs/plugin-vue": "^4.2.3",
     "autoprefixer": "^10.4.14",
-    "postcss": "^8.4.26",
+    "postcss": "^8.4.31",
     "tailwindcss": "^3.3.3",
     "vite": "^4.4.0"
   }