chore(deps): Bump torchvision from 0.18.1+rocm6.0 to 0.20.1+cxx11.abi in /backend/python/diffusers

chore(deps): Bump torchvision from 0.18.1+rocm6.0 to 0.20.1+cxx11.abi in /backend/python/diffusers #4196