chore(deps): update dependency astro to v6 [security]

Author: renovate[bot]

examples/solid/astro/package.json

@@ -17,7 +17,7 @@
     "@astrojs/vercel": "^8.1.3",
     "@tanstack/solid-query": "^5.100.12",
     "@tanstack/solid-query-devtools": "^5.100.12",
-    "astro": "^5.5.6",
+    "astro": "^6.0.0",
     "solid-js": "^1.9.7",
     "tailwindcss": "^3.4.7",
     "typescript": "5.8.3"