net/keycloak: Update 26.4.7 => 26.5.2
Release Notes:
https://www.keycloak.org/2026/01/keycloak-2650-released
https://www.keycloak.org/2026/01/keycloak-2651-released
https://www.keycloak.org/2026/01/keycloak-2652-released
PR: 293007
Security: CVE-2025-67735
Security: CVE-2025-66560
Security: CVE-2025-14559
MFH: 2026Q1