fix(deps): update dependency astro to v5

Author: renovate[bot]

package.json

@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@astrojs/starlight": "^0.28.0",
-    "astro": "^4.3.4",
+    "astro": "^5.0.0",
     "sharp": "^0.33.0"
   }
 }