Upgrade python six to allow 1.14.0

[AndWass]

Changelog: Feature: Update python six dependency to 1.14.0.
Docs: Omit

See #6506

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^{Note: By default this PR will skip the slower tests and will use a limited set of python versions. Check here how to increase the testing level by writing some tags in the current PR body text.}

[claassistantio]

All committers have signed the CLA.

[memsharded]

Thanks for the contribution!

I have merged it, will be released in next 1.23 release.
Does it make sense to add this also to the next patch release/1.22.1 which is still open? Is it a blocking issue? #6506 says it is impossible to install, but isn't it possible to force a given version to install?

[memsharded]

I have opened a PR to 1.22.1 #6509, to be prepared.