CLSA-2026-1788195197 sssd: Fix of CVE-2026-68744

CVE-2026-68744: heap information disclosure in the NSS responder's sssnssprotocolfillinitgr - the initgroups reply packet is sized for every group in the result set but never shrunk when entries are skipped as non-POSIX, incomplete or negative-cache filtered, so the unwritten tail of the packet...