fix(deps): update astro to v6.1.6 [security]

Author: renovate[bot]

package.json

@@ -54,7 +54,7 @@
     "@octokit/openapi-types": "27.0.0",
     "@tailwindcss/vite": "4.2.2",
     "accessible-astro-components": "5.2.0",
-    "astro": "6.1.5",
+    "astro": "6.1.6",
     "astro-icon": "1.1.5",
     "date-fns": "4.1.0",
     "marked": "18.0.0",