security/libssh: Update to 0.11.2
Changes: https://git.libssh.org/projects/libssh.git/tree/CHANGELOG?h=stable-0.11
Security: CVE-2025-4877, CVE-2025-4878, CVE-2025-5318, CVE-2025-5351, CVE-2025-5372, CVE-2025-5449, CVE-2025-5987
(cherry picked from commit f1fa5379e2f8c6c7c9437813fc9577a3e9755833)