fix(deps): update astro to v5.4.0

Author: renovate[bot]

package.json

@@ -42,7 +42,7 @@
     "@iconify-json/mdi": "1.2.3",
     "@octokit/openapi-types": "24.0.0",
     "@tailwindcss/vite": "4.0.9",
-    "astro": "5.3.1",
+    "astro": "5.4.0",
     "astro-icon": "1.1.5",
     "date-fns": "4.1.0",
     "marked": "15.0.7",