chore(deps): update nextra monorepo to v2.12.3

Author: renovate[bot]

packages/website/package.json

@@ -22,8 +22,8 @@
     "clsx": "2.0.0",
     "next": "13.4.19",
     "next-themes": "0.2.1",
-    "nextra": "2.12.2",
-    "nextra-theme-docs": "2.12.2",
+    "nextra": "2.12.3",
+    "nextra-theme-docs": "2.12.3",
     "postcss": "8.4.28",
     "postcss-lightningcss": "0.9.0",
     "react": "18.2.0",