update ubuntu python .deb requirement for dataclasses
update ubuntu python .deb requirement for dataclasses

Summary: We have dataclasses dependency now in eden_scm, which means python 3.7 or later

Reviewed By: quark-zju

Differential Revision: D33713759

fbshipit-source-id: 6f915238326201d7408f885804714981505b7fa8

facebook/wangle,facebook/wangle,facebook/wangle