chore(deps): update dependency postcss to v8.4.26

Author: renovate[bot]

packages/website/package.json

@@ -24,7 +24,7 @@
     "next-themes": "0.2.1",
     "nextra": "2.10.0",
     "nextra-theme-docs": "2.10.0",
-    "postcss": "8.4.25",
+    "postcss": "8.4.26",
     "postcss-lightningcss": "0.9.0",
     "react": "18.2.0",
     "react-docgen": "workspace:6.0.1",