net/keycloak: Update to 20.0.5

ChangeLog: https://www.keycloak.org/2023/02/keycloak-2005-released.html

Bugs:

• Fine-grained authorization behavior for management of groups differs between version 18.0.3 and 19.03, 20.0 keycloak-ui section/other
  • Not able to see the events UI keycloak-ui section/events
• Keycloak 20.0.2-1 OutOfMemoryError in admin ui keycloak-ui section/clients
• SAML client import cert pem file for "Encryption keys config" broken keycloak-ui section/clients
• Default value of NameID policy format is not correct in SAML Identity Provider keycloak-ui section/identity providers
• Escape character in SAML response keycloak saml
• OfflineSessionPersistenceTest times out with session preloading keycloak storage

PR: 269736
Reported by: freebsd@rheinwolf.de (maintainer)
MFH: 2023Q1 (bugfix release)

(cherry picked from commit a9555f688ecc5781e6831a1bdff90cfd11fe41ec)