chore(deps): 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:production
...

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

package.json

@@ -22,7 +22,7 @@
     "eslint": "8.41.0",
     "eslint-config-next": "13.4.4",
     "next": "13.5.1",
-    "postcss": "8.4.23",
+    "postcss": "8.4.31",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "tailwindcss": "3.3.2",