feat: enable dns caching by default (#4706)

packages/core/src/infrastructure/dns/env.ts

@@ -2,7 +2,7 @@ import { createBooleanSchema, createEnv } from "../env";
 
 export const dnsEnv = createEnv({
   server: {
-    ENABLE_DNS_CACHING: createBooleanSchema(false),
+    ENABLE_DNS_CACHING: createBooleanSchema(true),
   },
   experimental__runtimeEnv: process.env,
 });