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](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] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -38,7 +38,7 @@ typing-extensions = "^4.0.0"
 hiredis = "^2.0.0"
 
 [tool.poetry.dev-dependencies]
-mypy = "^0.930"
+mypy = "^0.931"
 pytest = "^6.2.4"
 ipdb = "^0.13.9"
 pylint = "^2.12.2"