Update dependency six to v1.15.0

[renovate]

This PR contains the following updates:

Package	Update	Change
six	minor	==1.13.0 -> ==1.15.0

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Release Notes

benjaminp/six

v1.15.0

Compare Source

• Pull request #​331: Optimize six.ensure_str and six.ensure_binary.

v1.14.0

Compare Source

• Issue #​288, pull request #​289: Add six.assertNotRegex.

• Issue #​317: six.moves._dummy_thread now points to the _thread module on
  Python 3.9+. Python 3.7 and later requires threading and deprecated the
  _dummy_thread module.

• Issue #​308, pull request #​314: Remove support for Python 2.6 and Python 3.2.

• Issue #​250, issue #​165, pull request #​251: six.wraps now ignores missing
  attributes. This follows the Python 3.2+ standard library behavior.

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File name: requirements.txt

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