fix(deps): update astro monorepo (#376)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -15,9 +15,9 @@
   },
   "dependencies": {
     "@astrojs/check": "0.9.4",
-    "@astrojs/cloudflare": "12.5.3",
+    "@astrojs/cloudflare": "12.5.4",
     "@astrojs/starlight": "0.34.3",
-    "astro": "5.8.2",
+    "astro": "5.9.3",
     "semver": "7.7.2",
     "sharp": "0.34.2",
     "starlight-package-managers": "0.11.0",