fix(deps): update astro monorepo

Author: renovate[bot]

package.json

@@ -24,7 +24,7 @@
     "@astrojs/sitemap": "^3.0.3",
     "@tailwindcss/postcss": "^4.1.4",
     "@tailwindcss/vite": "^4.1.4",
-    "astro": "5.8.1",
+    "astro": "5.9.0",
     "astro-compress": "^2.2.2",
     "astro-purgecss": "^5.0.0",
     "postcss": "^8.5.3",