fix(deps): update dependency astro to v6.3.0

Author: renovate[bot]

website/package.json

@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "@astrojs/sitemap": "3.7.2",
-    "astro": "6.1.9"
+    "astro": "6.3.0"
   },
   "devDependencies": {
     "@tailwindcss/vite": "4.2.4",