Fix incorrect torch version in CMake (#21007)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/20525
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21007
Differential Revision: D15515260
Pulled By: soumith
fbshipit-source-id: 149084cce276c5e76ca0c5c0872c5e990c47bdfd
