Officially deprecate support for python 3.8

[jleibs]

What

• Resolves: Communicate that python 3.8 support is deprecated #7830

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[github-actions]

Deployed docs

Commit	Link
218dcff	https://landing-3p9rs71x1-rerun.vercel.app/docs

[Wumpf]

neat!
haven't tried whether the warning triggers myself, but I trust you did :)

[abey79]

Well done. Just to be sure, do users have a means to silence those warning? They could be very annoying for a (still legitimate) use under 3.8. (Or do we think this barely happens anyways?)

[jleibs]

Python actually silences deprecation warnings by default in most user-facing contexts, which is a bit annoying and practically reduces the chances it will be seen by the users in practice, but that's the policy and I'm not going to fight it or workaround it.

Regardless, this is the "most right" way to handle it. If you enable deprecation warnings in your project config you'll see it, otherwise it won't be visible.

[jleibs]

Also worth noting that when we drop support, the new wheels will list their incompatibility so people installing will just get an older version or a pypi error if they try to install an explicit version in a 3.8 context.