chore(deps): update nextjs monorepo to v16

Author: renovate[bot]

package.json

@@ -46,7 +46,7 @@
     "@mui/lab": "6.0.1-beta.34",
     "@mui/material": "6.4.11",
     "@mui/material-nextjs": "6.4.3",
-    "@next/mdx": "15.3.2",
+    "@next/mdx": "16.0.0",
     "@rjsf/core": "5.24.12",
     "@rjsf/mui": "5.24.12",
     "@rjsf/utils": "5.24.12",
@@ -82,7 +82,7 @@
     "lodash-es": "4.17.21",
     "material-ui-popup-state": "5.3.6",
     "nanoid": "5.1.5",
-    "next": "15.3.2",
+    "next": "16.0.0",
     "next-http-proxy-middleware": "1.2.7",
     "nextjs-routes": "2.2.5",
     "node-fetch": "3.3.2",