OpenSSH 9.0 released

OpenSSH 9.0 has been released. It is claimed to be primarily a bug-fixrelease, but it also switches to a new, quantum-computer-proof key-exchangeprotocol by default and includes a number of sftp changes, some ofwhich may create some compatibility issues (described in the announcement)with scp.

We consider the removal of the need for double-quoting shellcharacters in file names to be a benefit and do not intend tointroduce bug-compatibility for legacy scp/rcp in scp(1) when usingthe SFTP protocol.