Why do you want to change the owner? Has the change set already been delivered?
If the change set has already been delivered, the owner is a user who performed to deliver. It doesn't make sense if you want to change so you can't change this.
If the change-set is still not completed, you will own it when you close/deliver it. We actually use this trick to pre-populate change-sets with default files checked-in by technical user but then delivered by team members.
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