SUSE-SU-2026:23056-1 Security update for libssh

This update for libssh fixes the following issues: - CVE-2026-3731: denial of Service via out-of-bounds read in SFTP extension name handler bsc1259377. - CVE-2026-59843: denial of service via zero advertised channel packet size bsc1272164. - CVE-2026-59844: denial of service via oversized SFTP re...