Bump six from 1.13.0 to 1.15.0 in /tools

[dependabot-preview]

Bumps six from 1.13.0 to 1.15.0.

Changelog

Sourced from six's changelog.

1.15.0

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

1.14.0

• 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.

Commits

• c0be881 Advance version to 1.15.0.
• 714f40f Document #331.
• 05c4f51 Optimize ensure_str and ensure_binary. (#331)
• a5bb7aa Fix ensure_text docs. (#326)
• 3a3db75 six 1.14.0
• be13e64 python-porting is dead.
• c8e190c Add change log for assertNotRegex.
• 10a2b75 Add assertNotRegex. (#289)
• 5cd83db New contributors.
• ab67534 version -> version_info
• Additional commits viewable in compare view

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[dependabot-preview]

Dependabot attempted to update this pull request, but because the branch dependabot/pip/tools/develop/six-1.15.0 is protected it was unable to do so.

[dependabot-preview]

Superseded by #381.