Update asgiref to 3.4.1

[pyup-bot]

This PR updates asgiref from 3.3.1 to 3.4.1.

Changelog

3.4.1

------------------

* Fixed an issue with the deadlock detection where it had false positives
during exception handling.

3.4.0

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* Calling sync_to_async directly from inside itself (which causes a deadlock
when in the default, thread-sensitive mode) now has deadlock detection.

* asyncio usage has been updated to use the new versions of get_event_loop,
ensure_future, wait and gather, avoiding deprecation warnings in Python 3.10.
Python 3.6 installs continue to use the old versions; this is only for 3.7+

* sync_to_async and async_to_sync now have improved type hints that pass
through the underlying function type correctly.

* All Websocket* types are now spelled WebSocket, to match our specs and the
official spelling. The old names will work until release 3.5.0, but will
raise deprecation warnings.

* The typing for WebSocketScope and HTTPScope's `extensions` key has been
fixed.

3.3.4

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* The async_to_sync type error is now a warning due the high false negative
rate when trying to detect coroutine-returning callables in Python.

3.3.3

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* The sync conversion functions now correctly detect functools.partial and other
wrappers around async functions on earlier Python releases.

3.3.2

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* SyncToAsync now takes an optional "executor" argument if you want to supply
your own executor rather than using the built-in one.

* async_to_sync and sync_to_async now check their arguments are functions of
the correct type.

* Raising CancelledError inside a SyncToAsync function no longer stops a future
call from functioning.

* ThreadSensitive now provides context hooks/override options so it can be
made to be sensitive in a unit smaller than threads (e.g. per request)

* Drop Python 3.5 support.

* Add type annotations.

Links

• PyPI: https://pypi.org/project/asgiref
• Changelog: https://pyup.io/changelogs/asgiref/
• Repo: https://github.com/django/asgiref/