fix(deps): update dependency astro to v4.16.18 (#322)

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

Author: renovate[bot]

package.json

@@ -17,7 +17,7 @@
     "@astrojs/check": "0.9.4",
     "@astrojs/cloudflare": "11.2.0",
     "@astrojs/starlight": "0.29.3",
-    "astro": "4.16.17",
+    "astro": "4.16.18",
     "semver": "7.6.3",
     "sharp": "0.33.5",
     "starlight-package-managers": "0.8.1",