update postcss

Author: notunderctrl

apps/docs/package.json

@@ -15,7 +15,7 @@
         "next": "13.5.2",
         "nextra": "^2.12.3",
         "nextra-theme-docs": "^2.12.3",
-        "postcss": "8.4.30",
+        "postcss": "8.4.31",
         "react": "18.2.0",
         "react-dom": "18.2.0",
         "tailwindcss": "3.3.3",