chore(deps): update dependency next-sitemap to v4

Author: renovate[bot]

firebase/functions/package-lock.json

@@ -27,7 +27,7 @@
     "joi": "17.8.3",
     "lodash.deburr": "4.1.0",
     "next": "13.2.3",
-    "next-sitemap": "3.1.55",
+    "next-sitemap": "4.0.5",
     "node-fetch": "3.3.0",
     "react-error-boundary": "3.1.4",
     "react-i18next": "12.2.0",

firebase/functions/package.json

@@ -40,7 +40,7 @@
     "eslint-plugin-prettier": "4.2.1",
     "eslint-plugin-react": "7.32.2",
     "eslint-plugin-react-hooks": "4.6.0",
-    "next-sitemap": "3.1.55",
+    "next-sitemap": "4.0.5",
     "prettier": "2.8.4"
   }
 }