pip prod(deps): bump mypy from 0.940 to 0.960 (#1170)

Bumps [mypy](https://github.com/python/mypy) from 0.940 to 0.960.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.940...v0.960)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:production
  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>

requirements-testing.txt

@@ -8,7 +8,7 @@ pytest-xdist == 2.5.0
 pytest-mock==3.6.1
 pytest-asyncio==0.16.0
 autopep8==1.6.0
-mypy==0.940
+mypy==0.960
 py-spy==0.3.11
 codecov==2.1.12
 tox==3.25.0