Update dependency @astrojs/sitemap to v1.4.0

Author: renovate[bot]

package.json

@@ -15,7 +15,7 @@
   "keywords": [],
   "devDependencies": {
     "@astrojs/mdx": "0.19.7",
-    "@astrojs/sitemap": "1.3.3",
+    "@astrojs/sitemap": "1.4.0",
     "@astrojs/solid-js": "2.2.0",
     "@cspell/eslint-plugin": "6.31.2",
     "@typescript-eslint/eslint-plugin": "5.62.0",