Remove redundant 3.6 code and bump mypy's python_version to 3.7 #3313
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Description
The https://github.com/psf/black/releases/tag/22.10.0 removed runtime support for EOL Python 3.6. 🚀
We can remove a few old checks and config.
Updating the mypy config means we can remove a couple of
# type: ignore
.Checklist - did you ...
CHANGES.md
if necessary?