Pin the rest of flake8 dependencies. (#48590)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48590
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: samestep
Differential Revision: D25220976
Pulled By: ezyang
fbshipit-source-id: 15817f8c5db7fea6efe9b70a1d1e46b8ca36d12b
