fix(deps): update nextjs monorepo to v15.3.0

Author: renovate[bot]

package.json

@@ -34,7 +34,7 @@
     "clsx": "^2.1.1",
     "geist": "^1.3.1",
     "lucide-react": "^0.487.0",
-    "next": "15.0.4",
+    "next": "15.3.0",
     "next-themes": "^0.4.3",
     "react": "19.1.0",
     "react-dom": "19.1.0",
@@ -56,7 +56,7 @@
     "@typescript-eslint/eslint-plugin": "^8.13.0",
     "@typescript-eslint/parser": "^8.13.0",
     "eslint": "^8.57.0",
-    "eslint-config-next": "15.0.4",
+    "eslint-config-next": "15.3.0",
     "eslint-config-prettier": "^10.0.0",
     "eslint-plugin-tailwindcss": "^3.17.5",
     "postcss": "^8.4.48",