openssh: Whitelist CVE-2021-36368

As per debian, the issue is fixed by a feature called
"agent restriction" in openssh 8.9.
Urgency is unimportant as per debian, Hence this CVE is whitelisting.
Link:
https://security-tracker.debian.org/tracker/CVE-2021-36368
https://bugzilla.mindrot.org/show_bug.cgi?id=3316#c2
https://docs.ssh-mitm.at/trivialauth.html



Signed-off-by: Pawan Badganchi <badganchipv@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>