devel/py-apns2: Mark DEPRECATED

Depends on https://github.com/python-hyper/hyper the development of
which has been stalled. It's advisable to use
https://github.com/Fatal1ty/aioapns which is in the tree
devel/py-aioapns.

Set EXPIRATION_DATE to 2022-06-30

PR: 262499
Approved by: olgeni (maintainer)