Cut over to batched DNS refreshing on host renames

TESTED=I deployed it on alpha, renamed some hosts, and verified that
the [] ran as expected.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=134991941

java/google/registry/flows/host/HostUpdateFlow.java

@@ -230,7 +230,7 @@ public final class HostUpdateFlow extends LoggedInFlow implements TransactionalF
       }
       // We must also enqueue updates for all domains that use this host as their nameserver so
       // that their NS records can be updated to point at the new name.
-      asyncFlowEnqueuer.enqueueLegacyAsyncDnsRefresh(existingResource);
+      asyncFlowEnqueuer.enqueueAsyncDnsRefresh(existingResource);
     }
   }