Change listen address to not force IPv6
What does this MR do?
Change the default listen address to :9252 in the config.toml file.
Why was this MR needed?
The current default address is [::]:9252 which causes error in the runner when the Kubernetes nodes/cluster doesn't support ipv6, as mention in this issue gitlab-org/gitlab-runner#4603 (moved).
What are the relevant issue numbers?
Edited by Tomasz Maczukin