fix(deps): update nextjs monorepo to v15.4.1

Author: renovate[bot]

package.json

@@ -31,7 +31,7 @@
     "jsdom": "^26.1.0",
     "lucide-react": "^0.525.0",
     "nc-analytics": "^0.0.9",
-    "next": "15.3.5",
+    "next": "15.4.1",
     "next-recaptcha-v3": "^1.5.2",
     "next-sitemap": "^4.2.3",
     "next-themes": "^0.4.6",
@@ -52,7 +52,7 @@
     "@types/react-dom": "^19.1.1",
     "dotenv": "^17.0.0",
     "eslint": "^8",
-    "eslint-config-next": "15.3.5",
+    "eslint-config-next": "15.4.1",
     "postcss": "^8.5.6",
     "tailwindcss": "^4.1.10",
     "tsx": "^4.20.3",