Bump postcss from 8.4.20 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.20 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@8.4.20...8.4.31)

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

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

app/package.json

@@ -44,7 +44,7 @@
         "@types/react": "^18.0.26",
         "autoprefixer": "^10.4.13",
         "next-transpile-modules": "10.0.0",
-        "postcss": "^8.4.20",
+        "postcss": "^8.4.31",
         "tailwindcss": "^3.2.4",
         "tsconfig": "workspace:*",
         "typescript": "^4.9.4"

packages/ui/package.json

@@ -9,7 +9,7 @@
         "@types/react-dom": "^18.0.10",
         "@types/react-table": "^7.7.13",
         "autoprefixer": "^10.4.13",
-        "postcss": "^8.4.20",
+        "postcss": "^8.4.31",
         "tailwindcss": "^3.2.4",
         "tsconfig": "workspace:*",
         "typescript": "^4.9.4"