I say "brought". I had a schoolfriend who said "brung" and "brang". In her case, there was no dialectal reason for it as far as being from a specific region is concerned. Her parents were both from the south of England and neither "brung" nor "brang" is normal here. However, I can only assume that one of them had been taught the form and had passed it on to their daughter.
I don't know which specific dialects use it.
Student or Learner