[Python-modules-team] Bug#973195: new upstream 2.4.2

[Matthias Klose]

Control: tags -1 + patch

the new upstream 2.4.2 fixes the 3.9 issues, and the package also seems to work
with python3-pycryptodome

one test is failing with both 3.8 and 3.9:

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ERROR: test_confirm (tests.test_agent._TestAgent)
Test confirmation of key
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Traceback (most recent call last):
  File "/<<PKGBUILDDIR>>/tests/util.py", line 69, in async_wrapper
    return self.loop.run_until_complete(coro(self, *args, **kwargs))
  File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
    return future.result()
  File "/<<PKGBUILDDIR>>/tests/test_agent.py", line 52, in agent_wrapper
    await func(self, agent)
  File "/<<PKGBUILDDIR>>/tests/test_agent.py", line 379, in test_confirm
    sig = await agent_key.sign(b'test')
  File "/<<PKGBUILDDIR>>/asyncssh/agent.py", line 147, in sign
    return await self._agent.sign(self.public_data, data, self._flags)
  File "/<<PKGBUILDDIR>>/asyncssh/agent.py", line 271, in sign
    raise ValueError('Unable to sign with requested key')
ValueError: Unable to sign with requested key

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packaging proposal at
https://launchpad.net/ubuntu/+source/python-asyncssh/2.4.2-0ubuntu1