Bump mypy from 0.812 to 0.901

Bumps [mypy](https://github.com/python/mypy) from 0.812 to 0.901.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](https://github.com/python/mypy/compare/v0.812...v0.901)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>