[Pick from #492]Update vendored version of six from "1.10.0" to "1.16.0"

[yndu13]

You need to complete

• [x] unit tests and/or feature tests
• [ ] documentation is changed or added

[codecov[bot]]

Codecov Report

Merging #512 (7af29f7) into master (894ebbb) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 7af29f7 differs from pull request most recent head 1ccb703. Consider uploading reports for the commit 1ccb703 to get more accurate results

@@           Coverage Diff           @@
##           master     #512   +/-   ##
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  Coverage   95.92%   95.92%           
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  Files          45       45           
  Lines        1916     1916           
  Branches      276      276           
=======================================
  Hits         1838     1838           
  Misses         56       56           
  Partials       22       22