Bump mypy from 0.931 to 0.940 (#420)

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

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -7,7 +7,7 @@ coverage==6.3.1
 docutils==0.18.1
 jinja2==3.0.3
 multidict==6.0.2
-mypy==0.931
+mypy==0.940
 pygments==2.11.2
 pytest==7.0.1
 pytest-aiohttp==1.0.3