openssh: Update to 9.9p2

This release exists primarily to fix two security bugs. The fixes have
been independently imported into FreeBSD. This import serves to update
the ssh and sshd version number.

A few minor bug fixes are also included; see the upstream release notes
for full details of the 9.9p2 release
(https://www.openssh.com/releasenotes.html).

Sponsored by: The FreeBSD Foundation