fixes fastai/fastai#3981 to stop deprecated warning messages #3994
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I have used the current torch.backends.mps.is_built attribute to replace the older has_mps has been deprecated about 6 months ago on this pytorch commit
I have tested on an M1 machine for the positive case should the mps.is_available (line above) return false. I have also tested this on a x86/nvidia machine and it remove the warning signs.
I have attached here a screenshot on how it can look like on google collab when its not fixed.