⬆️ Update asgiref to v3.8.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
asgiref (changelog)	==3.7.2 -> ==3.8.1

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Release Notes

django/asgiref (asgiref)

v3.8.1

Compare Source

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

v3.8.0

Compare Source

• 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.

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