[arch-devops] terraform 0.13 upgrade

Hey guys, Just a quick heads-up to please not upgrade to Terraform 0.13 if you want to use Terraform currently. I'll handle the upgrade once the Keycloak provider is available in the registry. In the mean time, please stay on Terraform 0.12. See https://gitlab.archlinux.org/archlinux/infrastructure/-/issues/100 Cheers, Sven