Bump mypy from 0.930 to 0.931

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

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

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

pyproject.toml

@@ -33,7 +33,7 @@ SQLAlchemy = "^1.4.31"
 pytest = "^6.2.5"
 black = {version = "^21.12b0", allow-prereleases = true}
 flake8 = "^4.0.1"
-mypy = "^0.930"
+mypy = "^0.931"
 types-pytz = "^2021.3.3"
 types-dateparser = "^1.0.10"