Update dependency asgiref to v3.8.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
asgiref (changelog)	==3.5.2 -> ==3.8.1

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Release Notes

django/asgiref (asgiref)

v3.8.1

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• Fixes a regression in 3.8.0 affecting nested task cancellation inside
  sync_to_async.

v3.8.0

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• Adds support for Python 3.12.

• Drops support for (end-of-life) Python 3.7.

• Fixes task cancellation propagation to subtasks when using synchronous Django
  middleware.

• Allows nesting sync_to_async via asyncio.wait_for.

• Corrects WSGI adapter handling of root path.

• Handles case where "client" is None in WsgiToAsgi adapter.

v3.7.2

• The type annotations for SyncToAsync and AsyncToSync have been changed to
  more accurately reflect the kind of callables they return.

v3.7.1

• On Python 3.10 and below, the version of the "typing_extensions" package
  is now constrained to be at least version 4 (as we depend on functionality
  in that version and above)

v3.7.0

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• Contextvars are now required for the implementation of sync as Python 3.6
  is now no longer a supported version.

• sync_to_async and async_to_sync now pass-through

• Debug and Lifespan State extensions have resulted in a typing change for some
  request and response types. This change should be backwards-compatible.

• asgiref frames will now be hidden in Django tracebacks by default.

• Raw performance and garbage collection improvements in Local, SyncToAsync,
  and AsyncToSync.

v3.6.0

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• Two new functions are added to the asgiref.sync module: iscoroutinefunction()
  and markcoroutinefunction().

  Python 3.12 deprecates asyncio.iscoroutinefunction() as an alias for
  inspect.iscoroutinefunction(), whilst also removing the _is_coroutine marker.
  The latter is replaced with the inspect.markcoroutinefunction decorator.

  The new asgiref.sync functions are compatibility shims for these
  functions that can be used until Python 3.12 is the minimum supported
  version.

  Note that these functions are considered beta, and as such, whilst
  not likely, are subject to change in a point release, until the final release
  of Python 3.12. They are included in asgiref now so that they can be
  adopted by Django 4.2, in preparation for support of Python 3.12.

• The loop argument to asgiref.timeout.timeout is deprecated. As per other
  asyncio based APIs, the running event loop is used by default. Note that
  asyncio provides timeout utilities from Python 3.11, and these should be
  preferred where available.

• Support for the ASGI_THREADS environment variable, used by
  SyncToAsync, is removed. In general, a running event-loop is not
  available to asgiref at import time, and so the default thread pool
  executor cannot be configured. Protocol servers, or applications, should set
  the default executor as required when configuring the event loop at
  application startup.

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