Fix manual seed to unpack unsigned long (#42206)
Summary:
`torch.manual_seed` was unpacking its argument as an `int64_t`. This fix changes it to a `uint64_t`.
Fixes https://github.com/pytorch/pytorch/issues/33546
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42206
Reviewed By: ezyang
Differential Revision: D22822098
Pulled By: albanD
fbshipit-source-id: 97c978139c5cb2d5b62cc2c963550c758ee994f7
