chore: add compatibilityDate for playground

Author: pi0

playground/nitro.config.ts

@@ -1,5 +1,5 @@
 import { defineNitroConfig } from "nitropack/config";
 
 export default defineNitroConfig({
-  compatibilityDate: "2024-06-12",
-});
+  compatibilityDate: "2024-09-25",
+});