Bump six from 1.15.0 to 1.16.0 (#1370)

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)

Signed-off-by: dependabot[bot] <support@github.com>

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

requirements.txt

@@ -36,7 +36,7 @@ repoze.sendmail==4.4.1
 requests==2.25.1
 requests-hawk==1.1.0
 s3transfer==0.4.2
-six==1.15.0
+six==1.16.0
 transaction==3.0.1
 translationstring==1.4
 ujson==4.0.2