ad-auth/sssd: Disable sssd-pac on Debian ≥bookworm

Relevant Debian and upstream bugs/mails:

• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1037930
• https://lists.fedorahosted.org/archives/list/sssd-users@lists.fedorahosted.org/thread/HQKQOX53YJ2DUNPYPQ4LC7R56UXO2R3Z/#27FR2CRABDFJIVXRFZUXF5GHDKF7PGT7
• https://lists.fedorahosted.org/archives/list/sssd-users@lists.fedorahosted.org/message/IUE3FRAV7OPFHELKWDZRPVZ2XMHBQM4R/