fix: Channel may be released after balance (#37862)

issue: #37830
casue dist handler doesn't set channel's version, so if channel checker
try to dedup channel, it may release the new delegator after balance
finished.

this PR fix the way to set proper version for channel.

Signed-off-by: Wei Liu <wei.liu@zilliz.com>

internal/querycoordv2/dist/dist_handler.go

@@ -181,7 +181,11 @@ func (dh *distHandler) updateChannelsDistribution(resp *querypb.GetDataDistribut
 				Version: ch.GetVersion(),
 			}
 		} else {
-			channel = channelInfo.Clone()
+			channel = &meta.DmChannel{
+				VchannelInfo: channelInfo.VchannelInfo,
+				Node:         resp.GetNodeID(),
+				Version:      ch.GetVersion(),
+			}
 		}
 		updates = append(updates, channel)
 	}