net/keycloak: Update to 19.0.3

ChangeLog: https://www.keycloak.org/2022/10/keycloak-1903-released.html

• AdminV2 not using admin hostname keycloak-ui admin/ui
• Clear expired events errors keycloak storage
• CryptoIntegration fails to init on WebSphere Liberty keycloak
• keycloak 19 legacy: unable to deploy war-packaged user storage provider keycloak storage
• Missing variable declaration in AuthZ JS keycloak adapter/javascript
• Browser-based flows not working properly due to 3rd party cookie policies on Firefox

PR: 266939
Reported by: freebsd@rheinwolf.de (maintainer)