ssh: update to OpenSSH v8.8p1
OpenSSH v8.8p1 was motivated primarily by a security update and
deprecation of RSA/SHA1 signatures. It also has a few minor bug fixes.
The security update was already applied to FreeBSD as an independent
change, and the RSA/SHA1 deprecation is excluded from this commit but
will immediately follow.
MFC after: 1 month
Relnotes: Yes
Sponsored by: The FreeBSD Foundation
(cherry picked from commit e9e8876a4d6afc1ad5315faaa191b25121a813d7)
(cherry picked from commit 2ffb13149c8e46cb7d7e891b237255615906dc60)
(cherry picked from commit f40841ea9e70c8605dad4e8693fd6a8689b5e324)