fix(deps): update dependency next to v16.1.6 (#819)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

integrations/nextjs/package.json

@@ -1,6 +1,6 @@
 {
   "dependencies": {
-    "next": "16.1.5",
+    "next": "16.1.6",
     "react": "19.2.4",
     "react-dom": "19.2.4",
     "resend": "../.."