Build(deps-dev): bump postcss from 8.4.23 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.23 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@8.4.23...8.4.31)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -106,7 +106,7 @@
     "eslint-plugin-storybook": "0.6.13",
     "lefthook": "1.4.3",
     "patch-package": "8.0.0",
-    "postcss": "8.4.23",
+    "postcss": "8.4.31",
     "prettier": "2.8.8",
     "storybook": "7.3.2",
     "storybook-addon-react-router-v6": "1.0.2",