⬆️ Bump mypy from 0.930 to 0.931 (#160)

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>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

dev-requirements.txt

@@ -6,5 +6,5 @@ Flask>=2.0,<3.0; python_version >= '3.6'
 requests>=2.26,<3.0; python_version >= '3.6'
 black==21.12b0; python_version >= '3.6'
 flake8==4.0.1; python_version >= '3.6'
-mypy==0.930; python_version >= '3.6'
+mypy==0.931; python_version >= '3.6'
 isort; python_version >= '3.6'