Bump six from 1.15.0 to 1.16.0 (#209)

Bumps [six](https://github.com/benjaminp/six) from 1.15.0 to 1.16.0.
- [Release notes](https://github.com/benjaminp/six/releases)
- [Changelog](https://github.com/benjaminp/six/blob/master/CHANGES)
- [Commits](benjaminp/six@1.15.0...1.16.0)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -26,7 +26,7 @@ python-dateutil==2.8.1
 redis==3.5.3
 requests==2.25.1
 simplejson==3.17.2
-six==1.15.0
+six==1.16.0
 transaction==3.0.1
 translationstring==1.4
 ujson==4.0.2