- deprecate cert based authentication for APNS

- replace `pyAPNS2` with `aioapns` to enable Django>=4.0 compatibility and resolve unmaintained `hyper` dependency
- increase minimum Python version to 3.6

- sumer time switch bugfix

…ead.

if code is executing in a non-main thread: By default, the main thread in Python has an event loop set up automatically. However, if the code is running in a separate thread, we need to manually create and set up an event loop for that thread.

Create event loop, if code is executing in non-main thread.

Create event loop, if code is executing in non-main thread.

Starting from Python 3, the __str__ method was introduced as a replacement for __unicode__ to provide a string representation of an object.

# Conflicts:
#	django_walletpass/admin.py
#	django_walletpass/models.py

…//xxxx/passes/) encountered error: Unexpected response code 404

…m server, and we are updating pass.

…eted from server, and we are updating pass."

This reverts commit 62cd074.

…ken with 164 chars