chore(deps): bump postcss from 8.4.24 to 8.4.31 in /apps/web

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](https://github.com/postcss/postcss/compare/8.4.24...8.4.31)

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

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

apps/web/package.json

@@ -30,7 +30,7 @@
     "next": "^13.4.7",
     "next-auth": "^4.22.1",
     "npm": "^9.7.2",
-    "postcss": "8.4.24",
+    "postcss": "8.4.31",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "react-hook-form": "^7.45.1",