Update dependency astro to v4.16.18 [SECURITY]

Author: renovate[bot]

package.json

@@ -16,7 +16,7 @@
     "@astrojs/sitemap": "3.2.0",
     "@astrojs/solid-js": "4.4.2",
     "@unocss/reset": "0.63.3",
-    "astro": "4.15.11",
+    "astro": "4.16.18",
     "prettier-plugin-astro": "0.14.1",
     "slug": "9.1.0",
     "typescript": "5.6.2",