Bump mypy from 1.1.1 to 1.4.0

Bumps [mypy](https://github.com/python/mypy) from 1.1.1 to 1.4.0.
- [Commits](python/mypy@v1.1.1...v1.4.0)

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

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