Fix windows cbuild pytest pytype error #590
Merged
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~3 days ago, pytest released version 5.0, which apparently breaks our Windows cbuild with pytype errors
http://go/gh/pytest-dev/pytest/releases/tag/5.0.0
This is probably because python 2 doesn't support type annotations, which the new release somehow changes the mock import to use or something. Considering that we still need to support python 2 for a while, don't move to the 5.0.0 release for now.
This change is