This patch should improve go mod handling of renovate

This patch adjusts the renovate config to allow upgrades to version 38

This patch adjusts renovate to automatically assign MRs to me, in order
to utilise the GitLab todo feature a bit better.

This patch increases the timeout for installation and upgrades, and adds
additional retries for upgrades and installation to make sure the
helmrelease object doesn't end up in a failed state as quickly as
before.

This patch adjusts the keycloak helm chart to use the upstream
recommended paths for exposing keycloak. It also adjusts the current
deployment to utilise a dedicated, further restricted admin interface.

BREAKING CHANGE: This commit will remove the exposure of the admin
interface as well as other exposed URLs.

References:
https://www.keycloak.org/server/reverseproxy#_exposed_path_recommendations