net/keycloak: Update 26.3.4 => 26.4.5

Changelogs:
https://www.keycloak.org/2025/09/keycloak-2635-released
https://www.keycloak.org/2025/09/keycloak-2640-released
https://www.keycloak.org/2025/10/keycloak-2641-released
https://www.keycloak.org/2025/10/keycloak-2642-released
https://www.keycloak.org/2025/11/keycloak-2644-released

PR: 290994
Security: CVE-2025-58057
Security: CVE-2025-58056
Security: CVE-2025-48924
Security: CVE-2025-7962
MFH: 2025Q4
(cherry picked from commit 88bce0ec31f02f9b25c272e91c9abfd903857d14)