fix(deps): update dependency astro to v5

Author: renovate[bot]

package.json

@@ -26,7 +26,7 @@
     "@astrojs/cloudflare": "^11.2.0",
     "@astrojs/mdx": "^3.1.8",
     "@astrojs/starlight": "^0.28.4",
-    "astro": "^4.16.7",
+    "astro": "^5.1.6",
     "astro-embed": "^0.8.0",
     "lite-youtube-embed": "^0.3.3",
     "typescript": "^5.6.3"