[APNS] Migrate to `apns2` or `aioapns`

[amotl]

Hi there,

@LaborEtArs asked at #396 (comment):

Are there plans to update the apns plugin to apns2?

apns did not receive any updates since 2015, apns2 does a better job here, the most recent release is from 2020. So, indeed, the plugin should be updated accordingly.

With kind regards,
Andreas.

[amotl]

On the issue tracker of the PyAPNs2 repository, I found those:

• Dependencies out of date Pr0Ger/PyAPNs2#74
• hyper dependency is no longer maintained Pr0Ger/PyAPNs2#126
• Python 3.10 compatibility Pr0Ger/PyAPNs2#141

Because of that, it looks like some other projects switched to the aioapns library in the meanwhile. We should probably do the same.

[amotl]

Dear @LaborEtArs,

if this can spark your interest, we will be very happy to receive corresponding patches in order to be able to support the Apple Push Notification service again. Based on my research, I think using the aioapns library would be the right choice today.

With kind regards,
Andreas.

[amotl]

I've also just evaluated apns2, but it will not work on Python3.11 until the issues referenced at #580 (comment) got resolved. There is progress on this now at Pr0Ger/PyAPNs2#149, thanks to @salty-horse.