fix(deps): update dependency date-fns to v4

Author: renovate[bot]

package-lock.json

@@ -36,7 +36,7 @@
     "@types/react": "19.2.14",
     "@types/react-dom": "19.2.3",
     "accept-language": "3.0.20",
-    "date-fns": "3.6.0",
+    "date-fns": "4.1.0",
     "dotenv": "17.3.1",
     "eslint": "^9.39.4",
     "eslint-config-next": "16.2.0",