fix: KiB, not MiB for ack size limits (#1999)

src/message-queues.ts

@@ -67,7 +67,7 @@ export interface BatchOptions {
 // This is the maximum number of bytes we will send for a batch of
 // ack/modack messages. The server itself has a maximum of 512KiB, so
 // we just pull back a little from that in case of unknown fenceposts.
-export const MAX_BATCH_BYTES = 510 * 1024 * 1024;
+export const MAX_BATCH_BYTES = 510 * 1024;
 
 /**
  * Error class used to signal a batch failure.