Update dependency astro to v5 [SECURITY]

Author: renovate[bot]

package.json

@@ -15,7 +15,7 @@
     "@astrojs/netlify": "2.5.0",
     "@astrojs/svelte": "3.1.0",
     "@astrojs/tailwind": "4.0.0",
-    "astro": "2.9.1",
+    "astro": "5.15.9",
     "gray-matter": "4.0.3",
     "prisma": "5.0.0",
     "svelte": "4.1.1",