.circleci: Add python 3.9 builds for windows (#48138)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48138
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Test Plan: Imported from OSS
Reviewed By: samestep
Differential Revision: D25039140
Pulled By: seemethere
fbshipit-source-id: d39885562bdd8078a9735f1bc20f9d81cb024edc
