Bump mypy from 0.942 to 0.950

Bumps [mypy](https://github.com/python/mypy) from 0.942 to 0.950.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.942...v0.950)

---
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

@@ -40,7 +40,7 @@ jupyter = ["ipywidgets"]
 [tool.poetry.dev-dependencies]
 pytest = "^7.0.0"
 black = "^22.3"
-mypy = "^0.942"
+mypy = "^0.950"
 pytest-cov = "^3.0.0"
 attrs = "^21.4.0"
 types-dataclasses = "^0.6.4"