[issue44498] add deprecation warnings for asynchat, asyncore and smtpd

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

> but only whether to issue the warning in 3.10 or 3.11. Is that correct?

Correct. It can also be mentioned in a more general message as long as people know that this is the plan and they have a chance to voice any concern to start on 3.10

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<https://bugs.python.org/issue44498>
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