fix(deps): update astro to v5.15.6 [security] (#266)

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

Author: renovate[bot]

package.json

@@ -42,7 +42,7 @@
     "@iconify-json/mdi": "1.2.3",
     "@octokit/openapi-types": "27.0.0",
     "@tailwindcss/vite": "4.1.17",
-    "astro": "5.15.5",
+    "astro": "5.15.6",
     "astro-icon": "1.1.5",
     "date-fns": "4.1.0",
     "marked": "17.0.0",