I am sure if you ask a million different people you will get a million different answers to this question...
Me personally, no I don't track that.... I've never had a reason to go back and check the version... but if I did, there is a clear log of updates in Adobe Launch that I could check if I really needed that info.... So given that question has never come up for us, tracking something that we aren't using doesn't seem like its worth taking up a dimension for.
However, before you remove anything, you should do your due diligence in checking with your team to be sure that this isn't being used by someone.
Though, if this is being used by a Data Lake (using raw data exports), then there seems to be a field called "code_ver" which according to the documentation is "AppMeasurement Library version used to compile and send the image request." So the information is technically available (without using up your own custom dimensions)... but only in raw data; not in Workspace or Data Warehouse