- update to 4.4.0:
  * Added the BlockingPortalProvider class to aid with
    constructing synchronous counterparts to asynchronous
    interfaces that would otherwise require multiple blocking
    portals
  * Added __slots__ to AsyncResource so that child classes can
    use __slots__
  * Added the TaskInfo.has_pending_cancellation() method
  * Fixed erroneous RuntimeError: called 'started' twice on the
    same task status when cancelling a task in a TaskGroup
    created with the start() method before the first checkpoint
    is reached after calling task_status.started()
  * Fixed two bugs with TaskGroup.start() on asyncio: Fixed
    erroneous RuntimeError: called 'started' twice on the same
    task status when cancelling a task in a TaskGroup created
    with the start() method before the first checkpoint is
    reached after calling task_status.started() (#706; PR by
    Dominik Schwabe) Fixed the entire task group being cancelled
    if a TaskGroup.start() call gets cancelled (#685, #710)
  * Fixed erroneous RuntimeError: called 'started' twice on the
    same task status when cancelling a task in a TaskGroup
    created with the start() method before the first checkpoint
    is reached after calling task_status.started()
  * Fixed the entire task group being cancelled if a
    TaskGroup.start() call gets cancelled
  * Fixed a race condition that caused crashes when multiple
    event loops of the same backend were running in separate
    threads and simultaneously attempted to use AnyIO for their
    first time
  * Fixed cancellation delivery on asyncio incrementing the wrong

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