Update dependency six to v1.16.0

This MR contains the following updates:

Package	Type	Update	Change
six	ironbank-pypi	minor	1.15.0 -> 1.16.0

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Release Notes

benjaminp/six

v1.16.0

Compare Source

• Pull request #​343, issue #​341, pull request #​349: Port _SixMetaPathImporter to Python 3.10.

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