Update six from 1.11.0 to 1.12.0 (#4358)
Update six from 1.11.0 to 1.12.0 (#4358)


KWierso/treeherder,KWierso/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder,edmorley/treeherder,edmorley/treeherder