net/keycloak: Update to 20.0.3

ChangeLog: https://www.keycloak.org/2023/01/keycloak-2003-released.html

 * User role mapping tab: Show effective client roles for a user keycloak-ui
 section/users
 * ProviderConfigProperty.MAP_TYPE error in new UI keycloak-ui section/identity
 providers
 * Unable to turn on "Bypass identity confirmation" keycloak-ui
 section/authentication
 * Adding Form sub-flow broken on admin v2 keycloak-ui section/authentication
 * Custom User Provider SPI: There are no settings to configure the periodically
 synchronization of users keycloak-ui section/user federation
 * Assign roles to account - paging doesn't work keycloak-ui section/users
 * Realm selector requires two clicks to select something keycloak-ui
 section/realms
 * User management -> User in 2 subgroups with the same group name assignment
 does not work keycloak-ui section/users
 * Invalid language tag error when changing realm localization settings
 keycloak-ui section/realm settings
 * `Missing ":type" param` in the Events page when there are Client Scope
 events keycloak-ui section/events
 * Import client broken keycloak-ui section/clients
 * New Admin Console only, unable to add client profile in the first client
 policy keycloak-ui section/realm settings
 * Disabling hostname strict in prod doesn't disable https keycloak dist/quarkus
 * snakeyaml vulnerability GHSA-3mc7-4q67-w48m impacting CLI keycloak admin/cli
 * The redirect URI cannot be verified during logout in the case when client
 was removed keycloak oidc
 * Wrong auth session id being used when validating auth session id cookies
 keycloak core
 * Update XStream to 1.4.20 to fix CVE-2022-40151 & CVE-2022-41966 keycloak
 * Timeout when executing command PutMapCommand keycloak storage
 * Set OkHttp to 4.10.0 in parent pom keycloak
 * Lack of validation of access token on client registrations endpoint keycloak
 oidc

PR:		268939
Reported by:	freebsd@rheinwolf.de (maintainer)
MFH:		2023Q1 (bugfix, security fixes)
Security:	CVE-2022-40151, CVE-2022-41966