Bump postcss from 8.4.14 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.14 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/8.4.14...8.4.31)

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

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

renderer/package.json

@@ -24,7 +24,7 @@
         "babel-plugin-module-resolver": "^4.1.0",
         "circular-dependency-plugin": "^5.2.2",
         "css-loader": "^6.5.1",
-        "postcss": "^8.4.5",
+        "postcss": "^8.4.31",
         "postcss-cli": "^9.1.0",
         "postcss-csso": "^6.0.0",
         "postcss-easy-import": "^4.0.0",