Upgrading the Code of Conduct

[Julian-O]

Short version: Any objections to updating to the latest version of our community guidelines?

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I am currently editing Kivy's Contribution Guidelines.

It links to Version 1.4 of the Contributor Covenant template. There is now a Version 2.1 available.

Skimming the two documents, I notice Version 2.1 includes details of the sort of actions that may be required [private written warnings, temporary bans, permanent bans, etc.]

I do see a lot of other wording changes, but nothing that seemed significant or raised my eyebrows.

Just want to make sure there are no objections from the Community to updating.

Also: The code of conduct requires contact details - See #5541. If the core developers would like to name two people to contact with such issues (e.g. Discord handles), now would be the perfect time! [I say two people, so there is no conflict if someone wants to complain about the primary contact.]