* Added support for creating and validating SSHSIG signatures, as well
as OpenSSH "allowed signers" files.
* Added support for ML-KEM key exchange from the PyCA cryptography
package when it is available. This avoids the need to have the
liboqs library installed to use ML-KEM. However, liboqs is still
required to support SNTRUP kex exchange.
* Fixed an issue with handling of SSH maximum packet size when opening
a new SSH channel, aborting with a protocol error if a peer attempts
to set this size to 0. Thanks go to GitHub user afldl for reporting
this issue and providing analysis and reproduction code.
* Fixed an issue with include directives in OpenSSH config files.
Thanks go to GitHub users sethholmes and tazle for reporting this
issue and providing analysis and a proposed fix.