security/vuxml: add FreeBSD SAs issued on 2026-08-25

FreeBSD-SA-26:56.hwpmc affects all supported releases
FreeBSD-SA-26:57.unix affects 15.0R and 15.1R
FreeBSD-SA-26:58.sound affects all supported releases
FreeBSD-SA-26:59.mac_do affects 15.0R and 15.1R
FreeBSD-SA-26:60.ppp affects all supported releases
FreeBSD-SA-26:62.tty affects all supported releases
FreeBSD-SA-26:63.posixshm affects all supported releases