chore(deps): update mypy requirement from ~=0.950 to ~=0.960 (#714)

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.950...v0.960)

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

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Pipfile

@@ -26,4 +26,4 @@ pylint = "~=2.13"
 astroid = "~=2.9"
 isort = "~=5.10"
 
-mypy = "~=0.950"
+mypy = "~=0.960"