The patch was mostly rolled into 4.5.6 but unfortunately the debug mode got left on in a couple of the scripts so these files will continue to be large. 4.5.7 will lower the logging level back to the normal level.
4.5.7 will also move the files from /tmp to /opt/zimbra/log and they will be part of the regular log rotation. In the meantime it is safe to truncate the files after stopping logger. They will be recreated upon restart.
% zmlogswatchctl stop
% rm -f /tmp/zmlogger.out /tmp/logswatch.out
% zmlogswatchctl start