Update nextjs monorepo to v15

Author: renovate[bot]

package.json

@@ -19,8 +19,8 @@
     "@vanilla-extract/css": "^1.15.3",
     "@vanilla-extract/next-plugin": "^2.4.3",
     "eslint": "^8.57.0",
-    "eslint-config-next": "^14.2.4",
-    "next": "^14.2.4",
+    "eslint-config-next": "^15.0.0",
+    "next": "^15.0.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "typescript": "^5.5.3",