chore(deps-dev): bump mypy from 0.931 to 0.991

Bumps [mypy](https://github.com/python/mypy) from 0.931 to 0.991.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.931...v0.991)

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

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

Author: dependabot[bot]

poetry.lock

@@ -50,7 +50,7 @@ flake8-bugbear = "^22.1.11"
 pyproject-flake8 = "^4.0.1"
 pre-commit = "^2.17.0"
 matplotlib = "^3.5.1"
-mypy = "^0.931"
+mypy = "^0.991"
 isort = "^5.10.1"
 black = "^22.3.0"