Add advisories affecting 13.3R, 14.0R, and 14.1R

FreeBSD-SA-24:04.openssh
FreeBSD-SA-24:05.pf
FreeBSD-SA-24:06.ktrace
FreeBSD-SA-24:07.nfsclient
FreeBSD-SA-24:08.openssh

Also include FreeBSD-SA-24:04.openssh in the 13.2R release notes since
the security team patched that release, despite it going out of support
one day before.