Log Message:
py-asyncssh: updated to 2.13.1

Release 2.13.1 (18 Feb 2023)
----------------------------

* Updated type definitions for mypy 1.0.0, removing a dependency on
  implicit Optional types, and working around an issue that could
  trigger a mypy internal error.

* Updated unit tests to avoid calculation of SHA-1 signatures, which
  are no longer allowed in cryptography 39.0.0.