chore(deps): pin dependency next to 15.2.4

Author: renovate[bot]

packages/nextjs/package.json

@@ -90,7 +90,7 @@
     "esbuild": "^0.24.2",
     "eslint": "8.57.0",
     "graphql": "^16.10.0",
-    "next": "^15.2.4",
+    "next": "15.2.4",
     "publint": "0.2.7",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",