Update nextjs monorepo to v16

Author: renovate[bot]

__tests__/package.json

@@ -14,7 +14,7 @@
     "update-config-version": "pnpm add --save-dev eslint-config-upleveled@latest --allow-build=unrs-resolver && pnpm upleveled-eslint-install"
   },
   "dependencies": {
-    "next": "^15.0.0"
+    "next": "^16.0.0"
   },
   "devDependencies": {
     "@types/node": "^24.0.0",

__tests__/pnpm-lock.yaml

@@ -37,7 +37,7 @@
   "dependencies": {
     "@babel/eslint-parser": "7.28.5",
     "@eslint/compat": "1.4.1",
-    "@next/eslint-plugin-next": "15.5.5",
+    "@next/eslint-plugin-next": "16.0.3",
     "@stylistic/eslint-plugin": "5.5.0",
     "@typescript-eslint/eslint-plugin": "8.46.4",
     "@typescript-eslint/parser": "8.46.4",