Use touch() in pathlib for better compatibility on Windows (#52729)
Summary:
https://github.com/pytorch/pytorch/issues/52477 introduced the usage of `touch`, which is not available on plain Windows environment, unless you made all the things come with Git Bash available. This PR fixes the build break on those systems by using the `touch` provided by Python pathlib.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52729
Reviewed By: anjali411
Differential Revision: D26666724
Pulled By: walterddr
fbshipit-source-id: aae357eb55c6787631eadf22bee7901ad3c2604e
