Log Message:
py-asyncssh: updated to 2.19.0

Release 2.19.0 (12 Dec 2024)

* Added support for WebAuthN authentication with U2F security keys,
  allowing non-admin Windows users to use these keys for authentication.
  Previously, authentication with U2F keys worked on Windows, but only
  for admin users.

* Added support for hostname canonicalization, compatible with the
  configuration parameters used in OpenSSH, as well as support for the
  "canonical" and "final" match keywords and negation support for
  match. Thanks go to GitHub user commonism who suggested this and
  provided a proposed implementation for negation.

* Added client and server support for SFTP copy-data extension and
  a new SFTP remote_copy() function which allows data to be moved
  between two remote files without downloading and re-uploading the
  data. Thanks go to Ali Khosravi for suggesting this addition.

* Moved project metadata from setup.py to pyproject.toml. Thanks go to
  Marc Mueller for contributing this.

* Updated SSH connection to keep strong references to outstanding
  tasks, to avoid potential issues with the garbage collector while
  the connection is active. Thanks go to GitHub user Birnendampf for
  pointing out this potential issue and suggesting a simple fix.

* Fixed some issues with block_size argument in SFTP copy functions.
  Thanks go to Krzysztof Kotlenga for finding and reporting these issues.

* Fixed an import error when fido2 package wasn't available. Thanks go
  to GitHub user commonism for reporting this issue.