Use newer keycloak

Here's the catch: Plack requires to access the IdP the same way the user would, on the browser.

In the context of KTD, this means that, for example, if we mapped keycloak to sso:8082 on the host machine (sso mapped as localhost in /etc/hosts), we could in theory make it work as we are already calling sso the keycloak service.

But the port won't work. The originally implemented docker image doesn't allow making it listen on port 8082. So we will shift to a newer release so we can.