Update python-mypy to 0.812
Mypy 0.800 officially supports the recently released Python 3.9.
Blog post here
Depends on D10575
Signed-off-by: Algent Albrahimi <email@example.com>
- Check for errors in pythons scripts located in mypy/test-data/samples/.
- Run a few python scripts in thonny.
Reviewers: Triage Team, DataDrake
Reviewed By: Triage Team, DataDrake
Differential Revision: https://dev.getsol.us/D10576