feat(ArNSNamesCache): reduce name list cache ttl to 5 minutes

This will help new name resolutions appear relatively quickly. That
said, we still have a more work to fully specify ArNS resolution
behavior. Expect revisions to this in the future.

src/config.ts

@@ -361,7 +361,7 @@ export const ARNS_ON_DEMAND_CIRCUIT_BREAKER_RESET_TIMEOUT_MS =
 
 export const ARNS_NAMES_CACHE_TTL_SECONDS = +env.varOrDefault(
   'ARNS_NAMES_CACHE_TTL_SECONDS',
-  `${60 * 60}`, // 1 hour
+  `${5 * 60}`, // 5 minutes
 );
 
 // TODO: support multiple gateway urls