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Version 15.1.1 has been published recently (2021-12-18) which contains an important security fix.
See https://groups.google.com/g/keycloak-user/c/Hr0awTh5ksA and keycloak/keycloak#9247 for details.
(There is also a new release 16.0.0 which updates to WildFly 25 but that should probably be a separate pull request.)