chore(deps): update ubuntu docker tag to v22

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This PR contains the following updates:

Package	Type	Update	Change
ubuntu	final	major	20.04 -> 22.04

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[TheKevJames]

Jammy can not longer build py3.5 and py3.6 without workarounds / a custom PPA (see https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa).

So far I've been keeping up support for older pythons here since it hasn't been a real inconvenience and being able to use this image for matrix testing against old and unsupported versions of Python can help folks who are still working through the upgrade process or want to support those that do.

@asottile the deadsnakes readme mentions you might be able to set up a private PPA for this use-case? What's the effort involved in something like that / is it something I could help with?

[asottile]

it requires forward porting openssl which I'm not really interested in doing or maintaining for free

[TheKevJames]

Ah, yeah, that would certainly not be a trivial amount of work. Very reasonable to avoid it!

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