Update nextra version

Author: pomber

examples/nextra/package.json

@@ -9,9 +9,9 @@
   },
   "dependencies": {
     "@code-hike/mdx": "^0.7.4",
-    "next": "^13.0.7",
-    "nextra": "2.0.1",
-    "nextra-theme-docs": "2.0.1",
+    "next": "13.1.2",
+    "nextra": "2.2.3",
+    "nextra-theme-docs": "2.2.3",
     "react": "^18.1.0",
     "react-dom": "^18.1.0"
   }