Bump mypy from 0.931 to 0.940 (#237)

Bumps [mypy](https://github.com/python/mypy) from 0.931 to 0.940.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.931...v0.940)

---
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

@@ -65,7 +65,7 @@ flake8-debugger = "^4.0"
 flake8-isort = "^4.0"
 pep8-naming = "^0.12"
 
-mypy = "^0.931"
+mypy = "^0.940"
 types-pkg-resources = "^0.1.3"
 
 safety = "^1.10"