Log Message:
py-anyio: updated to 3.3.1

**3.3.1**

- Added missing documentation for the ``ExceptionGroup.exceptions`` attribute
- Changed the asyncio test runner not to use uvloop by default (to match the \ 
behavior of
  ``anyio.run()``)
- Fixed ``RuntimeError`` on asyncio when a ``CancelledError`` is raised from a \ 
task spawned through
  a ``BlockingPortal``
- Fixed asyncio warning about a ``Future`` with an exception that was never \ 
retrieved which
  happened when a socket was already written to but the peer abruptly closed the \ 
connection