Update to astro5

Author: essential-randomness

astro-ao3-loader/package.json

@@ -31,10 +31,10 @@
   "license": "MIT",
   "dependencies": {
     "@fujocoded/ao3.js": "^0.22.1",
-    "@types/node": "^22.8.2",
-    "astro": "^4.16.7",
-    "yaml": "^2.8.2",
-    "zod": "^3.23.8"
+    "yaml": "^2.8.2"
+  },
+  "devDependencies": {
+    "astro": "^5.16.9"
   },
   "publishConfig": {
     "access": "public"