net/keycloak: Update 26.6.4 => 26.7.0 (4 CVEs)
Release Notes:
https://www.keycloak.org/2026/07/keycloak-2670-released
PR: 296639
Security: CVE-2026-9796
Security: CVE-2026-9689
Security: CVE-2026-9798
Security: CVE-2026-11986
Sponsored by: UNIS Labs
MFH: 2026Q3
(cherry picked from commit 09811b980fb36c7e860930992b1242580fb76dd8)