Bump version number to 7 and compile old operators with old schema (#68358)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/68358
Test Plan: Imported from OSS
Reviewed By: albanD
Differential Revision: D33433730
Pulled By: tugsbayasgalan
fbshipit-source-id: 202c58365bae13195d3545cefcb0da9162b02151
