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] <[email protected]>

Author: dependabot[bot]

platform/firecamp-ui/package.json

@@ -73,7 +73,7 @@
     "graphql": "^16.5.0",
     "jest": "^29.0.2",
     "jest-environment-jsdom": "^29.0.2",
-    "postcss": "^8.4.21",
+    "postcss": "^8.4.31",
     "postcss-cli": "^8.3.1",
     "raw-loader": "^4.0.2",
     "react-dom": "18.2.0",