Update dependency six to v1.13.0 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
six	minor	==1.12.0 -> ==1.13.0

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Release Notes

benjaminp/six

### [`v1.13.0`](https://togithub.com/benjaminp/six/blob/master/CHANGES#​1130) [Compare Source](https://togithub.com/benjaminp/six/compare/1.12.0...1.13.0) - Issue [#​298](https://togithub.com/benjaminp/six/issues/298), pull request [#​299](https://togithub.com/benjaminp/six/issues/299): Add `six.moves.dbm_ndbm`. - Issue [#​155](https://togithub.com/benjaminp/six/issues/155): Add `six.moves.collections_abc`, which aliases the `collections` module on Python 2-3.2 and the `collections.abc` on Python 3.3 and greater. - Pull request [#​304](https://togithub.com/benjaminp/six/issues/304): Re-add distutils fallback in `setup.py`. - Pull request [#​305](https://togithub.com/benjaminp/six/issues/305): On Python 3.7, `with_metaclass` supports classes using PEP 560 features.

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