Use conda-forge in mac mps test (#87155)
https://github.com/pytorch/pytorch/pull/87150 works, most of the jobs are ok now. However, I miss one last piece in MPS test workflow https://github.com/pytorch/pytorch/actions/runs/3269594289/jobs/5377469209. So this fixes the missing piece to use conda-forge
Pull Request resolved: https://github.com/pytorch/pytorch/pull/87155
Approved by: https://github.com/kit1980, https://github.com/ZainRizvi
