fix(deps): update astro monorepo

Author: renovate[bot]

package.json

@@ -23,7 +23,7 @@
     "@astrojs/rss": "^4.0.0",
     "@astrojs/sitemap": "^3.0.3",
     "@astrojs/tailwind": "^5.0.2",
-    "astro": "5.1.7",
+    "astro": "5.1.8",
     "astro-compress": "^2.2.2",
     "astro-purgecss": "^5.0.0",
     "tailwindcss": "^3.3.5"