Bump mypy from 0.930 to 0.931 (#307)

Bumps [mypy](https://github.com/python/mypy) from 0.930 to 0.931.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.930...v0.931)

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

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

poetry.lock

@@ -29,7 +29,7 @@ pre-commit = "^2.16"
 black = {version = "^21.12b0", allow-prereleases = true}
 pylint = "^2.12.2"
 isort = "^5.10.1"
-mypy = "^0.930"
+mypy = "^0.931"
 flake8 = "^4.0.1"
 pyupgrade = "^2.30.0"
 pytest-asyncio = "^0.16.0"