setup: Only include dataclasses for py < 3.8 (#45611)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45611
dataclasses was made a standard library item in 3.8
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Test Plan: Imported from OSS
Reviewed By: walterddr
Differential Revision: D24031740
Pulled By: seemethere
fbshipit-source-id: 15bdf1fe0d8de9b8ba7912e4a651f06b18d516ee
