fix(deps): update astro to v5.16.0 (#564)

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

Author: renovate[bot]

package.json

@@ -53,7 +53,7 @@
     "@octokit/openapi-types": "27.0.0",
     "@tailwindcss/vite": "4.1.17",
     "accessible-astro-components": "5.0.3",
-    "astro": "5.15.9",
+    "astro": "5.16.0",
     "astro-icon": "1.1.5",
     "date-fns": "4.1.0",
     "marked": "17.0.0",