Bump mypy from 0.931 to 0.940

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:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements-ci.txt

@@ -1,7 +1,7 @@
 pytest==7.0.1
 pytest-cov==3.0.0
 coveralls==3.3.1
-mypy==0.931
+mypy==0.940
 pydocstyle==6.1.1
 flake8==4.0.1
 pylint==2.12.2