fix(deps): update dependency astro to v5.16.9 (freeCodeCamp#1133)

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

Author: renovate[bot]

package.json

@@ -28,7 +28,7 @@
     "@astrojs/starlight": "0.37.2",
     "@astrojs/starlight-tailwind": "4.0.2",
     "@tailwindcss/vite": "4.1.18",
-    "astro": "5.16.8",
+    "astro": "5.16.9",
     "starlight-links-validator": "0.19.2",
     "starlight-scroll-to-top": "0.4.0",
     "tailwindcss": "4.1.18",