Bump mypy from 0.950 to 0.960

Bumps [mypy](https://github.com/python/mypy) from 0.950 to 0.960.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](https://github.com/python/mypy/compare/v0.950...v0.960)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Pipfile.lock

@@ -121,66 +121,66 @@
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@@ -250,32 +250,32 @@
         },
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@@ -376,7 +376,7 @@
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