[numpy] `torch.rsqrt` : promote integer inputs to float (#47909)
Summary:
Reference https://github.com/pytorch/pytorch/issues/42515
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47909
Reviewed By: ngimel
Differential Revision: D25730876
Pulled By: mruberry
fbshipit-source-id: c87a8f686e1dd64e511640e0278021c4a584ccf2
