chore(deps-dev): bump postcss from 8.4.27 to 8.4.31 in /web (#156)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.27 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@8.4.27...8.4.31)

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

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web/package.json

@@ -60,7 +60,7 @@
     "autoprefixer": "10.4.15",
     "eslint": "8.48.0",
     "nodemailer": "^6.9.3",
-    "postcss": "8.4.27",
+    "postcss": "8.4.31",
     "prettier": "^3.0.0",
     "tailwindcss": "3.3.3",
     "typescript": "5.1.6"