Log Message:
py-asyncssh: updated to 2.18.0

Release 2.18.0 (26 Oct 2024)
----------------------------

* Added support for post-quantum ML-KEM key exchange algorithms,
  interoperable with OpenSSH 9.9.

* Added support for the OpenSSH "limits" extension, allowing the
  client to query server limits such as the maximum supported read
  and write sizes. The client will automatically default to the reported
  maximum size on servers that support this extension.

* Added more ways to specify environment variables via the `env` option.
  Sequences of either 'key=value' strings or (key, value) tuples are now
  supported, in addition to a dict.

* Added support for getting/setting environment variables as byte strings
  on platforms which support it. Previously, only Unicode strings were
  accepted and they were always encoded on the wire using UTF-8.

* Added support for non-TCP sockets (such as a socketpair) as the `sock`
  parameter in connect calls. Thanks go to Christian Wendt for reporting
  this problem and proposing a fix.

* Changed compression to be disabled by default to avoid it becoming a
  performance bottleneck on high-bandwidth connections. This now also
  matches the OpenSSH default.

* Improved speed of parallelized SFTP reads when read-ahead goes beyond
  the end of the file. Thanks go to Maximilian Knespel for reporting
  this issue and providing performance measurements on the code before
  and after the change.

* Improved cancellation handling during SCP transfers.

* Improved support for selecting the currently available security key
  when the application lists multiple keys to try. Thanks go to GitHub
  user zanda8893 for reporting the issue and helping to work out the
  details of the problem.

* Improved handling of reverse DNS failures in host-based authentication.
  Thanks go to GitHub user xBiggs for suggesting this change.

* Improved debug logging of byte strings with non-printable characters.

* Switched to using an executor on GSSAPI calls to avoid blocking the
  event loop.

* Fixed handling of "UserKnownHostsFile none" in config files. This
  previously caused it to use the default known hosts, rather than
  disabling known host checking.

* Fixed a runtime warning about not awaiting a coroutine in unit tests.

* Fixed a unit test failure on Windows when calling abort on a transport.

* Fixed a problem where a "MAC verification failed" error was sometimes
  sent on connection close.

* Fixed SSHClientProcess code to not raise a runtime exception when
  waiting more than once for a process to finish. Thanks go to GitHub
  user starflows for reporting this issue.

* Handled an error when attempting to import older verions of pyOpenSSL.
  Thanks go to Maximilian Knespel for reporting this issue and testing
  the fix.

* Updated simple_server example code to switch from crypt to bcrypt,
  since crypt has been removed in Python 3.13. Thanks go to Colin
  Watson for providing this update.